UN Secretary-General Antonio Guterres on Friday sent "heartfelt condolences" to a Gaza family of which eight members were killed in an Israeli missile strike.

Axar.az reports citing Xinhua.

"The secretary-general expresses his heartfelt condolences to the Al-Sawarkeh family and wishes for a speedy recovery to the injured, and he calls on Israel to move swiftly with the investigation," said Farhan Haq, deputy spokesman for Guterres.

"We are opposed to all killings of civilians," Haq told a regular press briefing. "In the case of the Sawarkeh family, it's clearly a tragedy."

Israel aimed to take out a jihadist leader but hit the house of the family while they were asleep early on Thursday, according to media reports.