Washington has frequently pressed Israel to improve humanitarian conditions in Gaza since the war with Hamas began with the Palestinian militant group's attacks on southern Israel

The US has written to Israel, giving it 30 days to boost humanitarian aid access in Gaza or risk having some US military assistance cut off. The letter, sent on Sunday, amounts to the strongest known written warning from the US to its ally and comes amid a new Israeli offensive in northern Gaza that has reportedly caused a large number of civilian casualties.