When the police and soldiers arrived in the middle of the night, they fired their guns into the air, threw stones through the windows and threatened to drive a car through the front door if no one opened it. U Shwe Win and his family were asleep. It was 2:30 a.m.
The police and soldiers had come to arrest Mr. Shwe Win’s son, Ko Win Htut Nyein. When they found him, they beat and handcuffed the 19-year-old before hauling him away. His offense, the family was told, was taking videos of the police at a protest in Mandalay the day before.
More than two weeks later, Mr. Shwe Win is still searching for his son. The authorities say they have no record of his arrest. “I felt so hopeless, like I had lost everything at that moment,” Mr. Shwe Win said. “I still don’t know where my son is. I don’t want him to die in their hands, and I worry that they will torture him.”
Since the Feb. 1 coup in Myanmar, millions of pro-democracy protesters have joined demonstrations against the military and participated in general strikes and a civil disobedience movement that have brought the economy to a virtual halt. Security forces have responded with increasing ruthlessness, shooting people in the streets and arbitrarily beating and arresting people.
Politicians, journalists, students and ordinary citizens have all been caught in the military’s clutches. Soldiers and the police invade homes in the middle of the night, searching for opponents of military rule. Many have gone into hiding. Some are arrested and released. Others wind up missing, tortured or dead.
The military’s actions have sent a chilling message: No one is safe.
“The scale of arrests since the coup gives you a clear indication of where the military junta is taking the country: a place with no space for critics or any political opposition to exist,” said Mu Sochua, a former member of Cambodia’s Parliament and part of a group of Southeast Asian parliamentarians who promote human rights.
As of Friday, the security forces had killed more than 320 people and arrested or charged more than 3,000, according to a group tracking arrests and killings. The youngest victim, 6, was shot and killed on Wednesday while sitting on her father’s lap.
According to the United Nations High Commissioner for Human Rights, hundreds who were unlawfully detained have disappeared. At least five have died in custody, and two appeared to have been tortured, the agency said.
As they carry out their arrests, soldiers and the police steal money, mobile phones and car keys, victims and witnesses said in interviews. Some protesters have said they were released only after paying money to the police.
They are the lucky ones.
In Mandalay, Ko Myo Hein Kyaw, 24, disappeared after his arrest at a protest. His family was informed Friday — four days later — that he had died and that his body had been cremated.
In other cases, bodies have been returned to families with visible injuries and little explanation.
U Zaw Myat Lynn, an activist with the National League for Democracy who headed a vocational training center for the party, was arrested around midnight on March 8. The next day, the police directed his wife, Daw Phyu Phyu Win, to go to a military hospital to identify his body.
She saw many bruises on his face, she said in an interview.
The rest of the body was wrapped in a cloth, but photos showed a wound to his abdomen, which was listed as the cause of death.
The official autopsy report said he had suffered the abdomen injury during an escape attempt when he jumped from a height of 30 feet onto a fence. His wife believes he was stabbed to death.
“When I saw his dead body, I was sure that they killed my husband after torturing him,” she said.
In the search for fugitives and anti-coup leaders, one common tactic is for the police to arrest family members and colleagues and try to extract useful information from them. Many of those being hunted are elected officials who have gone into hiding, including members of Parliament who have formed a group claiming to be Myanmar’s lawful government.
U Sithu Maung, 33, is one of the lawmakers, and has been the target of a weekslong manhunt.
At 9:30 on the evening of March 6, soldiers and the police arrived at the home of one of Mr. Sithu Maung’s close associates from the National League for Democracy, U Khin Maung Latt.
Mr. Khin Maung Latt was arrested, and the next morning, family members were notified to pick up his body. The family found bruising on his back and stitches in his scalp, Mr. Sithu Maung said.
“It is such a big loss for me as he was my colleague, comrade and like my real uncle,” he said in an interview from hiding. “It was an assassination of a responsible citizen.”
That same night, soldiers and the police raided the home of Mr. Sithu Maung’s parents, breaking down the door and holding everyone at gunpoint, family members said.
When they failed to find Mr. Sithu Maung, the police arrested his father, who ran out the back door, where the security forces were waiting for him.
They beat his father and struck him on the head with a gun, family members said. Ransacking the house, they took two cellphones and $4,000 in gold and cash. When they left, they fired their guns and threw a stun grenade into the street.
“This pattern of violence has been seen across Yangon and other cities,” Mr. Sithu Maung said. “They come and search for someone. If they cannot find that person, they commit violence and take the family members of the person they targeted.”
The regime’s spokesman, Brig. Gen. Zaw Min Tun, acknowledged at a news conference Tuesday that the security forces had killed 164 people, but claimed they all died while attacking the police and soldiers with Molotov cocktails and homemade smoke bombs.
The military did not comment on the protesters who have died or gone missing after being detained.
Members of the public now commonly call the security forces “terrorists” for their brutal methods when carrying out arrests and shooting randomly into crowds and homes.
In southern Myanmar, students from Myeik University gathered for a protest when soldiers and the police arrived. One student, Ma Thae Ei Phyu, 22, a philosophy major, was shot in the back of the neck with rubber bullets from a few feet away.
“I tried not to fall down because I know they have a habit of raping women and girls,” she said. “I didn’t want to get arrested.”
The soldiers rounded up the entire group of about 70 protesters and took them to a nearby air force base and beat them with sticks, plastic pipes, chains and belts, said a teacher, U Nay Lin, 30, who was among those arrested. The beating left huge red welts crisscrossing his back, a photo showed.
Mr. Nay Lin said a man with a tattoo of Ms. Aung San Suu Kyi on his chest received the worst beating of all.
Ms. Thae Ei Phyu was taken to a hospital, where she received stitches for the deep holes in her neck caused by the rubber bullets. She and most of the others were eventually released without charges. Earlier this week, the junta also released more than 600 mostly young protesters who had been detained in Yangon, in a seeming effort to appease the movement.
“They tried to threaten us by arresting and torturing us like this, but we aren’t afraid to die,” she said. “It’s better to die than living under the junta.”