(CNN) — Israel carried out several strikes on Gaza and ordered a halt to humanitarian aid after accusing Hamas of violating a US-brokered ceasefire.

The truce that ended months of fighting is in its second week and has seen previous accusations from both sides of violations but is now facing its most serious test yet.

An Israeli military official said Hamas attacked Israeli forces in Rafah in southern Gaza with rocket-propelled grenades and sniper fire, prompting Israel to carry out strikes in the area.

Hamas fired towards Israeli forces beyond the Yellow Line - the line behind which Israeli troops have withdrawn according to the ceasefire deal - in three separate incidents Sunday, according to another military official.

One source familiar with the incident in Rafah said Israeli forc

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