3. Building used as a makeshift hospital by Army of Islam, a coalition of Islamist rebel groups
4. Mid of building
5. SOUNDBITE (Arabic) Khaled Mahmoud Nuseir, survivor of alleged chemical attack in Douma:
"I came back from my work around dusk then went down to the basement, we were around 50 to 60 people in the basement. All the alley was in this basement. We were praying during the dusk prayers when we felt a bottle of gas was opened - it was not a hit. I fainted for almost 10 hours. When I woke up, I ran to the hospital here, where the (Syrian) Civil Defence (commonly known as the White Helmets) were. So we asked them to bring the people, but they did not accept. I told them: 'For God's sake, the people are still alive.' They did not accept to go and help. I woke up at two o'clock after midnight (0200 local time), I ran to the basement and found my children and my wife on the ground with foam at their mouths. I carried my children to the hospital and they (White Helmets) did not help me until the next day. At 10 o'clock we brought them out, while they refused to help. On the second day, local officials (from the local council of Douma) came to inspect. We went up and found a missile with a certain volume, but it had not exploded - as if someone put it there and opened it, but it was not dropped by a plane. We could not see anything. We were in the basement and if someone came and shot us we would not know."
6. Photos of Nuseir's children on his mobile phone
7. SOUNDBITE (Arabic) Khaled Mahmoud Nuseir, survivor of alleged chemical attack in Douma:
"They had masks and refused to bring anyone to the hospital. There was a man who woke up on the second day. We asked him if someone came. He said no one came but only two (people) came filming and did not take anyone."
8. Close of camera
9. SOUNDBITE (Arabic) Khaled Mahmoud Nuseir, survivor of alleged chemical attack in Douma:
"The Army of Islam is behind it. They did it. They destroyed the country and escaped."
(Question: "What was the smell?")
"It was something yellow that approached us, like a yellow dust."
10. Wide of destroyed buildings
11. People watching from a balcony
12. Exterior of building allegedly attacked with chemical agents
Associated Press journalists on a government-organised media facility to the town of Douma, near the Syrian capital, spoke to residents who described a terrifying gas attack on April 7 they blame on a coalition of rebel groups.
Residents say the people most affected in the suspected attack near Douma's Martyrs Square were children and the elderly.
One resident, Khaled Nuseir, said 47 people were killed, including his pregnant wife and two young daughters, in one underground shelter.
The floor of the shelter on Monday was covered with carpets with pillows lining a side of the wall.
No blood stains were seen.
Survivors recalled a strong chlorine smell that quickly spread through the neighbourhood.
Residents said they survived by putting vinegar and water cloths on their mouths and rushing to higher floors to get away from the smoke and smell.
The survivors blamed the attack on the Army of Islam, the powerful rebel group that controlled the town before it was taken over by the Syrian government this week, although they did not offer evidence to back up their claims.