BEIRUT — The Arab League was set to vote Sunday on sweeping sanctions against Syria, as Damascus slammed the move as a betrayal of Arab solidarity.

Syria is facing mounting international pressure to end the bloody crackdown on the uprising against President Bashar Assad, which the U.N. says has killed more than 3,500 people since March. The European Union and the United States have imposed several rounds of sanctions against Assad and his regime, including a ban on the import of Syrian oil.

The 22-nation Arab League was to vote Sunday on whether to impose its own sanctions, which could include halting cooperation with Syria’s central bank and stopping flights to the country. If the Arab League goes ahead with the sanctions, it will be a huge blow for a regime that considers itself a powerhouse of Arab nationalism.

The state-owned Al-Thawra newspaper ran a front-page headline Sunday saying the Arab League is calling for “economic and commercial sanctions targeting the Syrian people.”

The measure is “unprecedented and contradicts the rules of Arab cooperation,” the paper said.

Since the revolt began, the regime has blamed armed gangs acting out a foreign conspiracy for the bloodshed.

It is not clear whether Arab sanctions would succeed in pressuring the Syrian regime into putting an end to the violence that has claimed the lives of dozens of Syrians, week after week. Many fear the violence is pushing the country toward civil war.

Until recently, most of the bloodshed was caused by security forces firing on mainly peaceful protests. But there have been growing reports of army defectors and armed civilians fighting Assad’s forces — a development that some say plays into the regime’s hands by giving government troops a pretext to crack down with overwhelming force.

On Sunday, activists reported fierce clashes in the flashpoint city of Homs, in central Syria, pitting soldiers against army defectors.

Many of the attacks against Syrian security forces are believed to be carried out by a group of army defectors known as the Free Syrian Army.

The Arab League’s recommendations for sanctions specified that the Arab bloc will assist Syria with emergency aid through the help of the International Red Cross and Red Crescent, working with local civilian groups to deliver goods.

Syrian neighbors Iraq and Lebanon already have expressed reservations about the sanctions.

Syria is a geographical and political keystone in the heart of the Middle East, bordering five countries with whom it shares religious and ethnic minorities and, in Israel’s case, a fragile truce. Its web of allegiances extends to Lebanon’s powerful Hezbollah movement and Iran’s Shiite theocracy.

Also Sunday, Jordanian Foreign Minister Nasser Judeh acknowledged that 100 Syrian military and police deserters have taken refuge in the kingdom throughout the uprising. It was the first official public confirmation that Jordan hosts Syrian defectors.

In September, officials said privately that Jordan had received 60 Syrian army and police deserters, who ranged in rank from corporal to colonel.

Judeh told The Associated Press that the Syrian soldiers and policemen, whom he claimed were conscripts rather than officers, had arrived in batches over the last eight months.

Many Syrians fleeing President Bashar Assad’s crackdown have also sought refuge in neighboring Turkey.