At least 41 people were killed and 45 injured in a fire inside a church in the Egyptian city of Giza on Sunday.
An electrical fire broke out during Mass as 5,000 people gathered at the Coptic Abu Sifin church in the Imbaba neighbourhood, the sources said.
The fire blocked an entrance to the church, causing a stampede, they said, adding that most of those killed were children.
"People were gathering on the third and fourth floor, and we saw smoke coming from the second floor. People rushed to go down the stairs and stared falling on top of each other," said Yasir Munir, a worshipper at the church.
"Then we heard a bang and sparks and fire coming out of the window," he said, saying he and his daughter were on the ground floor and able to escape.
Giza, Egypt's second-largest city, lies just across the Nile from Cairo.
"I offer my sincere condolences to the families of the innocent victims that have passed on to be with their Lord in one of his houses of worship," said Egyptian president Abdel Fattah al-Sisi in a tweet.


Trump dismisses Iran's reply to peace plan, oil jumps as Hormuz closure persists
Evacuation of passengers from virus-hit cruise ship to be completed on Monday
Philippine lawmakers to vote on impeachment of presidential hopeful Duterte
Six people found dead in boxcar in Texas, police say
Turkish Airlines plane evacuated due to tyre fire after landing in Kathmandu
Thailand's former PM Thaksin Shinawatra released from prison
Iran sends its response to US proposal aimed at ending the war
Ukraine, Russia ceasefire strained as both sides report weekend attacks
