During the 1990s, Israeli AH-64As frequently attacked Hezbollah outposts in Lebanon. On 13 April 1996, during Operation Grapes of Wrath, an Apache fired two Hellfire missiles at an ambulance in Lebanon, killing six civilians. During the al-Aqsa Intifada in the 2000s, AH-64s were used to kill senior Hamas figures, such as Ahmed Yassin, Abdel Aziz al-Rantisi, and Adnan al-Ghoul. IAF Apaches played a prominent role in the 2006 Lebanon War, launching strikes into Lebanon targeting Hezbollah forces. During the Lebanon War in 2006, two AH-64As collided, killing one pilot and critically wounding three. In another incident in the conflict, an IAF AH-64D crashed due to a main rotor malfunction, killing the two crew. In late 2007, the IAF put further purchases and deliveries of AH-64Ds on hold while its performance envelope was investigated. Israeli officials praised the Apache for its role in Operation Cast Lead in 2008, against Hamas in Gaza. IAF Apaches have often patrolled the skies over Gaza; strikes against insurgents by these helicopters has become a frequent occurrence.