An Israeli air strike on a hospital in Gaza killed a senior Hamas leader and an aide on Sunday evening, a Hamas official told the BBC.

Ismail Barhoum, the group's finance chief, was hit in Nasser Hospital, in Khan Younis.

Barhoum is one of the most senior Hamas figures killed since Israel resumed military action against the group last Tuesday, ending a two-month ceasefire.

Hamas said Barhoum was being treated in Nasser Hospital for wounds suffered in an air strike four days ago.

But Israel Defense Forces (IDF) spokesman Lt Col Nadav Shoshani said that was "completely false". He said Barhoum was in the hospital "in order to commit acts of terrorism" and had been there for weeks.