Freed Palestinian prisoner Palestinian Yehiye Sinwar, a founder of Hamas' military wing, center, is greeted by Gaza's Hamas Prime Minister Ismail Haniyeh during a rally celebrating the release of Palestinian prisoners in Gaza City, Tuesday, Oct. 18, 2011. Sinwar, a founder of Hamas' military wing, told the crowd that Palestinian militant groups must win freedom for the remaining prisoners by "all necessary means. Sinwar, among those freed Tuesday, had been sentenced to life for his role in the abduction and killing of two Israeli soldiers in the 1980's. He stopped short of calling for new abductions in his speech, but did so in interviews earlier in the day. (AP Photo/Adel Hana)

Photo by: Adel Hana

Freed Palestinian prisoner Palestinian Yehiye Sinwar, a founder of Hamas' military wing, center, is greeted by Gaza's Hamas Prime Minister Ismail Haniyeh during a rally celebrating the release of Palestinian prisoners in Gaza City, Tuesday, Oct. 18, 2011. Sinwar, a founder of Hamas' military wing, told the crowd that Palestinian militant groups must win freedom for the remaining prisoners by "all necessary means. Sinwar, among those freed Tuesday, had been sentenced to life for his role in the abduction and killing of two Israeli soldiers in the 1980's. He stopped short of calling for new abductions in his speech, but did so in interviews earlier in the day. (AP Photo/Adel Hana)