DAMASCUS/BEIRUT - Syria's government misread how Israel would respond to its troops deploying to the country's south this week, encouraged by U.S. messaging that Syria should be governed as a centralized state, eight sources familiar with the matter told Reuters.

Israel carried out strikes on Syrian troops and on Damascus on Wednesday in an escalation that took the Islamist-led leadership by surprise, the sources said, after government forces were accused of killing scores of people in the Druze city of Sweida.

Damascus believed it had a green light from both the U.S. and Israel to dispatch its forces south despite months of Israeli warnings not to do so, according to the sources, which include Syrian political and military officials, two diplomats, and regional security sources.

That understanding was based on public and private comments from U.S. special envoy for Syria Thomas Barrack, as well as on nascent security talks with Israel, the sources said. Barrack has called for Syria to be centrally administered as "one country" without autonomous zones.

Syria's understanding of U.S. and Israeli messages regarding its troop deployment to the south has not been previously reported.

A State Department spokesperson declined to comment on private diplomatic discussions but said the United States supported the territorial unity of Syria. "The Syrian state has an obligation to protect all Syrians, including minority groups," the spokesperson said, urging the Syrian government to hold perpetrators of violence accountable.

In response to Reuters questions, a senior official from Syria's ministry of foreign affairs denied that Barrack's comments had influenced the decision to deploy troops, which was made based on "purely national considerations" and with the aim of "stopping the bloodshed, protecting civilians and preventing the escalation of civil conflict".

Damascus sent troops and tanks to Sweida province on Monday to quell fighting between Bedouin tribes and armed factions within the Druze community - a minority that follows a religion derived from Islam, with followers in Syria, Lebanon and Israel.