Israeli army on Monday shut down commercial crossing points into Gaza in response to a rocket attack that targeted southern Israel territories a day earlier.
Palestinian security sources said that the work at Karni and Sofa crossings, the main gates through which trucks enter Gaza, completely stopped. Israel also closed fuel pipes at Nahal Oz crossing and left Erez crossing open only for urgent medical cases.
On Sunday, four rockets were fired from northern Gaza Strip, according to Israeli media reports and Palestinian witnesses. Three of the rockets exploded prematurely and one landed in the Israeli city of Sderot, causing fire but no casualties.
The rocket attack and the subsequent closure of the crossing points violate an Egyptian-brokered ceasefire between Israel and Islamic Hamas movement which now controls the Gaza Strip.
Israeli defense minister Ehud Barak ordered the closure while no Palestinian group claimed responsibility for the attack.
"Closing the crossings is a deliberate breakdown of the lull's articles by Israel," Hamas said in a statement sent to the reporters.
The six-month ceasefire, took effect in June, calls on Israel to open the commercial crossings in exchange for calm.
The deal is intended to ease the blockade which Israel imposed on Gaza last year, when Hamas took over the coastal Strip by force after routing the regular forces of the Palestinian Authority (PA).
The last time Israel shut the crossings at some point in the ceasefire was on August 26, after militants fired two rockets into Western Negev.
Despite the relative calm, Israel still restricts the flow of cargo into Gaza Strip.