At least 21 people - including 10 children - have been killed by a fire in a building in a densely populated refugee camp in the Gaza Strip, a hospital director has said.

The number of deaths at Jabalia refugee camp following the fire - which is now under control - is likely to rise, Dr Salah Abu Laila added.

A local security official said an initial investigation suggested there was a gas leak from a kitchen. Jabalia is one of eight camps in Gaza.

The West Bank-based Palestinian President Mahmoud Abbas called it a national tragedy and announced a day of mourning on Friday.

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