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Burhan Ozbilici, Associated Press
Syrian refugees seen in a camp set up by Turkish Red Crescent in the Turkish town of Yayladagi in Hatay province, Turkey, Friday, June 10, 2011. The Turkish region borders with Syria and said Wednesday it would open its border to aid Syrians who are fleeing from violence, as Syrian troops backed by dozens of tanks massed near the border, Friday, preparing to move on protesters and mutinous forces.

BEIRUT — Syrian tanks sealed a restive northern city Saturday, and activists said they expected an all-out government assault on the region near the Turkish border.

President Bashar Assad has sent heavy armor, including tanks, and thousands of troops to the region as he struggles to crush a nearly three-month uprising against his family's 40-year rule. Human rights groups say more than 1,300 people have died in the government crackdown.

The military operation in the mostly deserted town of Jisr al-Shughour is in response to what the government claims were attacks by "armed groups" that killed more than 120 officers and security personnel. Refugees reaching Turkey said the chaos erupted as government forces and police mutinied and joined the local population against Assad forces.

Syrian state television on Saturday said army units arrested several leaders of the alleged armed groups in the area of Jisr al-Shughour, a city of about 40,000. About 80 percent of the population has fled, with more than 4,000 Syrians taking sanctuary across the Turkish frontier.

Syrian troops backed by dozens of tanks have been operating in the area for several days, securing towns and villages on their way to Jisr al-Shughour.

Government forces reportedly have been in position for an attack on Jisr al-Shughour for about two days, and it was not clear what was delaying the army from entering the town.

City resident and activist Jamil Saeb, reached by phone, suggested the army was afraid to take on people still in the town because they "are known to be exceptionally fierce."

He said several army deserters and officers were still in the town and have vowed to fight back and to protect the other, unarmed residents.

Jisr al-Shughour and the province of Idlib have a history of animosity toward the regime in Damascus. The town's Muslim Brotherhood population rose up against Assad's father, the late president Hafez Assad, in the late 1970s. It came under heavy government bombardment in 1980, with a reported 70 people killed. Residents say the numbers were much higher.

The events proved a prelude to a 1982 three-week bombing campaign against the city of Hama that crushed a Sunni uprising there, killing 10,000 to 25,000 people, according to Amnesty International estimates.

"We hope we will not have to take up weapons," Saeb said, adding remaining residents were so far insisting on "peaceful resistance." Saeb spoke using a Turkish mobile phone from a town only few miles from the border.

Confirming information out of Syria is difficult. Communications are cut in areas where the uprising is strongest, including Jisr al-Shughour. Syrians who speak openly face retribution from the regime, and foreign journalists have been expelled.

Undaunted by the continuing and brutal crackdown, protests extended to every major city Friday, and activists said 36 people were killed when security forces opened fire during demonstrations across the country. The dead included 20 from the northern Idlib province, home to Jisr al-Shughour.

Twenty-five miles (40 kilometers) to the southeast in the town of Maaret al-Numan, thousands of protesters overwhelmed security forces and torched the courthouse and police station. The army responded with tank shells, a Syrian opposition figure told The Associated Press by telephone, speaking on condition of anonymity, fearing retribution.

Syrian TV appeared to confirm at least part of the report, saying gunmen opened fire on police stations, causing casualties among security officials.

Backed by helicopters and tanks, the troops responsible for most of Friday's violence were believed to be from an elite division commanded by Assad's younger brother, Maher. The decision to mobilize his unit against the most serious threats to the Assad regime could be a sign of concern about the loyalty of regular conscripts.

Syria's brutal crackdown has angered the leader of neighboring Turkey, who accused the Assad regime of "savagery."

A Turkish official at Altinozu on the Turkish side of the border said capacity was near full at the camp there and newcomers would be taken to a third camp at Boynuyogun. Workers on Saturday were putting the final touches to the camp there, welding fences around the camp and laying power lines.

"We don't expect the inflow to end rapidly. The news we are hearing is that there are more people waiting to get in on the other side," said UNHCR spokesman Metin Corabatir.

In an interview with Turkey's NTV television late Friday, Turkish Prime Minister Recep Tayyip Erdogan said he would discuss events in Syria with Assad "in a very different way" after Turkey's general elections on Sunday. Erdogan has hardened his tone against the Syrian regime, accusing Maher on Thursday of "chasing after savagery."

Turkey has vowed to keep it's border open to fleeing refugees.

The New York-based Human Rights Watch called Saturday on U.N. Security Council members to support a resolution demanding an immediate end to the Syrian government's brutal crackdown.

"The Security Council's complete silence in the face of mass atrocities against the people of Syria is emboldening the Syrian government in its bloody crackdown," said Philippe Bolopion, UN director at Human Rights Watch.

"A veto by Russia and China to protect the Syrian government and block efforts to stop the killings would be a serious betrayal of Syria's beleaguered citizens."

AP writer Selcan Hacaoglu contributed to this report from Boynuyogun Village, Turkey.