An Israeli security official said the transfer of aid into the territory is halted "until further notice," the first major test of the ceasefire.

The hard-won ceasefire between Israel and Hamas appeared threatened on Sunday as Israel accused the Palestinian Islamist group of attacking its troops in the Gaza Strip, before launching fresh strikes in response.

Israel has accused Hamas of attacking Israeli forces in southern Gaza with the military carrying out airstrikes in the city of Rafah, the first major test of the US-brokered ceasefire.

Israel strikes targets in Gaza and halts the arrival of aid after it said Hamas militants fired on Israeli troops.

A Hamas delegation was to meet Qatari and Egyptian officials in Cairo on Monday to discuss the continuation of a fragile Gaza ceasefire.

A Hamas team led by Khalil al-Hayya is holding talks in Cairo with Qatari and Egyptian mediators to preserve the Gaza ceasefire after renewed Israeli airstrikes and mutual accusations of truce violations.

Israel launched deadly strikes in the Gaza Strip on Sunday, saying they were in response to attacks by Hamas militants, as the nine-day-old ceasefire in the Palestinian territory came under heavy strain.