BOURJ AL-MULOUK, Lebanon — Israeli war planes renewed strikes against Beirut's southern suburbs today for the first time in nearly a week and an Israeli missile killed three in a border village, a day after Hezbollah launched its biggest rocket attacks yet against Israel.

Three weeks into the conflict, six Israeli brigades — or roughly 10,000 troops — were locked in fighting with hundreds of Hezbollah guerrillas in southern Lebanon.

Lebanese Prime Minister Fuad Saniora said more than 900 people have been killed and 3,000 injured in the fighting. More than 1 million people — a quarter of Lebanon's population — have been displaced, he said.

Although diplomatic efforts to stop the fighting have thus far faltered, diplomats said the United States and France were working on two U.N. resolutions to overcome the impasse.

The Israeli army said its soldiers had taken up positions in or near 11 towns and villages across south Lebanon as they try to carve out a five-mile-wide Hezbollah-free zone.

Most of the villages are close to the Israel-Lebanon border; the one deepest inside Lebanon, Majdel Zoun, is about four miles from the frontier. However, many tanks pushed even further north, controlling open areas from higher ground, security officials said.

In heavy ground fighting, one Israeli soldier was killed and four wounded around the south Lebanon village of Ayt a-Shab, the Israeli military said. It claimed four Hezbollah fighters were killed and two wounded in the region, but Hezbollah did not confirm the report.

Lebanese security officials said a missile crashed into a two-story house in the border village of Taibeh, killing a couple and their daughter.

Hezbollah's Al-Manar television reported that guerrillas also clashed with Israeli troops in the village, less than three miles from the border, destroying a tank and two bulldozers and injuring its crew members. The Israeli army said a tank had been lightly hit in clashes but that there were no casualties or serious damage.

An Israeli-American man was killed near a northern town, and another 21 were injured elsewhere across Israel as Hezbollah fired a record 210 rockets into the country. Across northern Israel, forests and fields lay scorched from rocket fire.

BAGHDAD, Iraq — Hundreds of followers of a radical Shiite cleric left a southern Iraqi city today to join a rally in the capital condemning Israeli attacks on Lebanon, while at least 13 people were killed or found dead in the latest sectarian violence.Muqtada al-Sadr, a firebrand anti-U.S. cleric who commands a large militia, has called on his followers from around the country to congregate in Baghdad on Friday after the weekly prayers. The rally, scheduled to be held in the Shiite slum of Sadr City in eastern Baghdad, will show support for the Shiite Lebanese guerrilla group Hezbollah in its fight against Israel.Gunmen today shot to death four people in separate incidents in Baghdad, Amarrah, Mosul and Basra, police said. The bodies of nine men were also found floating in the Tigris River, police and morgue officials said. At least two bodies had been blindfolded, bound and shot.On Wednesday, sectarian and political violence claimed at least 53 lives, including 11 young soccer players and spectators who died when two bombs exploded in a field in a Shiite neighborhood of Baghdad.The surge in sectarian violence has prompted the U.S. command to send at least 3,700 American soldiers from the northern city of Mosul to reclaim the capital's streets from Sunni insurgents, Shiite militias, rogue police, criminals and freelance gunmen.