Sobhani, who began working for Reuters as a driver and fixer in 2002 and has been a photographer since 2007, was among the journalists who had raced to cover the initial explosion on Monday morning in the Shashdarak area of central Kabul, not far from the U.S. embassy.

"I had been waiting with other journalists to cover an earlier blast. It was a normal scene. It was about 8:30 in the morning, there were security forces guarding the site of the first blast and quite a few people going to work and we were just waiting with other journalists," he says.

"Then we heard a huge bang just behind me. I survived because I was standing in front of a concrete pillar that shielded me from the force of the explosion, but I saw all my friends and colleagues on the ground and a lot of them were dead with a few wounded - you can still see the smoke from the explosion in the pictures."