Cairo - Egypt plans to press ahead with air strikes against terrorist Islamist militants in neighbouring who were responsible for killing at least 30 Egyptian Christians in an ambush last week. Libyan military commanders said Egyptian jets hit the Libyan city of Derna on Monday, continuing attacks that began hours after masked men boarded vehicles driving dozens of people to a monastery in the southern Egyptian province of Minya on Friday and killed 29. A witness said on Monday one air attack hit the western entrance to Derna and two others hit Dahr al-Hamar in the city's south. 'The air strikes are joint ones between the Libyan National Army and Egyptian army,' said Ahmad Messmari, a spokesman for the Libyan National Army, an eastern Libyan faction allied with Egypt.