By September 1981, the Front's operations consisted of car bombs exploding regularly in the Palestinian neighborhoods of Beirut and other Lebanese cities. Particularly deadly attacks include an October 1, 1981 attack in Beirut that killed 83 and a November 29, 1981 attack in Aleppo that killed 90. FLLF operations came to a sudden halt just prior to the June 1982 Israeli invasion of Lebanon, only to be resumed the following year: first a 28 January 1983 strike on a PLO headquarters at Chtaura in the Syrian-controlled Beqaa Valley, killing 35, coupled by a second on 3 February at West Beirut that devastated the Palestine Research Center offices and left 20 people dead, including the wife of Sabri Jiryis. A third bombing occurred on Syrian-controlled Baalbek on 7 August 1983, which killed about 30 people and injured nearly 40, followed by another on 5 December 1983 at the Chyah quarter of the Southern suburbs of Beirut that claimed the lives of 12 people and maimed over 80.