Israeli military jets carried out a series of airstrikes on separate targets in the Gaza Strip early Sunday, in response to a rocket being fired into Israel on Saturday, according to dpa. Witnesses said that a series of explosions were heard in northern and southern Gaza Strip as Israeli jets flew overhead. Hamas officials said that four successive airstrikes hit training areas. Ashraf al-Qedra, emergency spokesman in the Gaza Ministry of Health, told reporters that no injuries were reported following the successive airstrikes.