Paracha is on the first left. He and his friend Hassan Javed Khan (second right) both managed to escape from the gunmen who killed more than 150 people after attacking a school in Peshawar.
On the second left of the bottom picture is Rafiq Bangash and on the far right is Mohammad Yassen: neither of them were able to escape the terrorists.
He told MailOnline:
Muhammed was very keen on cricket and cars and had recently taken up photography. On Sunday he posted a very poignant selfie which looked like he had turned his back to us. He Facebooked me over the weekend because I had posted a funny video on my page and he 'liked' it. He wrote 'lol' and a few smiley faces.'It hasn't sunk in that I won't speak to him or hear from him again.
Yesterday teachers returned for the first time to the school: there has been an extended break across the country following the massacre.