JERUSALEM - A leading human rights group called Thursday for militant groups in Lebanon and Gaza to free Israeli soldiers they seized in cross-border raids last summer and for Israel to release Hamas lawmakers rounded up after the abductions.

Palestinian gunmen with links to the Islamic Hamas movement tunneled from Gaza into Israel, killed two Israeli soldiers and captured tank crewman Cpl. Gilad Shalit, on June 25, 2006. Three weeks later, Lebanese Hezbollah guerrillas crossed Israel's northern border and captured two soldiers, Eldad Regev and Ehud Goldwasser, triggering a 34-day war between Israel and Hezbollah in southern Lebanon.

All three are still missing, although Hamas last week released a recorded message from Shalit, the first sign of life from the young serviceman since he was snatched.

"The groups holding these soldiers hostage must release them immediately," the statement quoted Human Rights Watch Middle East director Sarah Leah Whitson as saying.

The statement came a day after a Hamas-linked group freed British journalist Alan Johnston, kidnapped by gunmen from a Gaza City street and held for 16 weeks.

Israel rounded up more than 60 Hamas officials in the wake of Shalit's capture, among them 36 lawmakers, in an operation widely viewed as an effort to collect bargaining chips to force his release. All but a handful are still in custody, although Palestinian officials said that Hatim Qafisheh, a legislator from the Hebron area, was freed on Thursday.

"It was only after Cpl. Shalit's capture that Israel started arresting Hamas legislators and ministers who had participated in Israeli-sanctioned Palestinian elections in January 2006," said Whitson. "Israel's response to hostage-taking should not include arbitrary arrests."

In a report earlier this week, Human Rights Watch said Palestinian rocket attacks on Israeli towns and Israeli artillery strikes near populated areas in northern Gaza constituted serious violations of the rules of war and said both sides showed "insufficient regard for civilian life." - Agencies