GAZA CITY - Israeli warplanes carried out an air raid in the northern Gaza Strip on Monday without causing casualties, the army and witnesses said. “The IDF (Israel Defence Forces) carried out an aerial attack in the north of the Gaza Strip region, targeting a Qassam launcher,” an army spokesman said, referring to homemade rockets fired by Gaza militants into Israel.No one was hurt in the attack near the northern town of Beit Hanun, witnesses said, where the previous day Israeli planes launched a strike on a rocket launcher, also without causing casualties.