GAZA, Sept 7 (Reuters) - A Palestinian militant was killed and two others were wounded in the central Gaza Strip on Wednesday, Gaza hospital officials and militants said, in an explosion they blamed on an Israeli air strike, but the military denied this.

An Israeli army spokeswoman said there had been no military activity in the area. It definitely wasn't us, she said.

The Islamic Jihad militant group said the three men were members of their organization.

It was a second straight day in which militants died in the Gaza Strip. On Tuesday Israeli troops killed a Palestinian gunman and wounded two civilians during an incursion into the southern Gaza Strip.

Israel and the Islamist group Hamas, which controls the Gaza Strip, agreed to a ceasefire after five days of cross-border violence late last month when 15 Palestinians, including five civilians, and one Israeli were killed.

The violence erupted following a deadly clash with Gaza militants along the Israel-Egypt border when eight Israelis -- six civilians and two soldiers -- were killed. At least seven of the attackers were also killed, Israel said. (Reporting by Nidal al-Mughrabi, writing by Ori Lewis in Jerusalem)