The ongoing Israeli offensive against the Gaza Strip killed 13 Palestinian civilians on Tuesday afternoon, adding the fatalities increased to 35.

According to witness and medical sources in Shifa Hospital in Gaza City, Israeli air strikes hit a four-floor building in northern Gaza City, killing 12 members from a family, including a mother and her children.

Also on Tuesday afternoon, a woman was killed by Israeli shelling in Jabaria in northern Gaza Strip.

Meanwhile, the Palestinian Telecommunication Company warned on Tuesday that their generators of service station in Gaza are running out of fuel within 48 hours. If they can't get fuel supply, all the communication, including landline telephone and mobiles, will halt.

Earlier on Tuesday morning, at least 22 Palestinians were killed in separate Israeli air strikes and tank shelling, according to a Palestinian health official.

The death toll since the beginning of the Israeli Operation Cast Lead on December 27 rose to 586 with some 2,600 other wounded.