The United Nations refugee agency says the number of Syrians fleeing to Jordan has doubled in recent days, with 10,200 arriving in the past week, signaling what could be an impending mass movement.

Spokeswoman Melissa Fleming of the U.N. High Commissioner for Refugees says the new arrivals at the Za'atri camp in northern Jordan are mainly from Syria's southern flashpoint area of Daraa. She says refugees reported “being bombed as they were trying to cross” the border.

The U.N. agency says up to 200,000 Syrian refugees could flee to Turkey if the conflict continues to deepen. More than 3,000 refugees fled Syria to Turkey in the past 24 hours alone.

The exodus comes as Syrian state television is reporting that 12 people were killed and nearly 50 wounded in a car bomb explosion at a funeral on the outskirts of Damascus.

The blast took place in the Druze and Christian suburb of Jaramana around the southeastern part of the capital.

An activist group, the Syrian Observatory for Human Rights, said the funeral was being held for two government supporters killed in a bomb attack on Monday.

In Tehran, Syrian Deputy Foreign Minister Faisal Mekdad told reporters at a summit of the Non-Aligned Movement that member nations have condemned sanctions imposed against Syria by the West and some other countries. He also warned countries not to support Syrian rebels, who he called “terrorists.”

“Any support by any foreign country of the terrorists in Syria is absolutely condemned, and we tell them that once you support terrorism in Syria it will come back to your own country. Stop it!”

Meanwhile, The Associated Press reported that Syrian military helicopters dropped thousands of leaflets over Damascus and its suburbs Tuesday, urging rebels to hand over their weapons or be killed.

The AP said some of the leaflets read “The Syrian army is determined to cleanse every inch in Syria and you have only two choices: abandon your weapons … or face inevitable death.''

Syrian authorities blame the 17-month uprising on a foreign conspiracy and accuse oil-rich Gulf countries Saudi Arabia and Qatar, in addition to the United States and Turkey, of backing “terrorists” seeking to oust the government of President Bashar al-Assad.