GAZA: An eyewitness reported to Reuters on explosions early Monday as Israel's military heard several explosions early on Monday as Israel's military claimed it attacked a facility used by Hamas to build rockets in the Palestinian enclave.

No immediate reports of casualties were made following the airstrikes, which came after Israel claimed to have shot down a rocket fired over the border from Gaza over the weekend. For that launch, there was no Palestinian claim.

Witnesses claimed that troops had surrounded a home in the city of Nablus in the Israeli-occupied West Bank, another Palestinian territory, resulting in gunfire and possibly fatalities.

The Den of Lions, a group of Palestinian assailants primarily based in Nablus and the neighboring city of Jenin, which has been the target of stepped-up Israeli raids over the past year, claimed responsibility for ambushing an army unit. Israel didn't respond right away.

In 2007, Hamas militants took over Gaza, where they have since fought multiple wars with Israel. Israel typically responds to attacks from smaller Gazan factions by Hamas.

According to Palestinian sources, Israeli ground forces on Monday also fired on border positions controlled by Hamas. In Israeli towns close to the Gaza border, sirens sounded as a precaution against potential new rocket launches.