The strikes by Israel's military on UN buildings in Gaza "do not appear to be accidental", the UN human rights chief Navi Pillay has said.

Ms Pillay also called for international law with "appropriate investigation, prosecution and punishment" to be applied to the incidents.

The Israeli military have said they will investigate the incidents but that they have a policy of not targeting civilians.

Since 8 July, 1,390 Palestinians have been killed - most of them civilians - according to the Gaza Health Ministry.

Some 58 Israelis have been killed, of which 56 were soldiers and two civilians.