NEW : Activist , citing the intensity of the gunfire , predicts the death toll will rise . Protesters attacked in Maaret al-Nouman , witnesses say . Comment: Syrian families chant `` Thank you , Erdogan ''
NEW : Activist , citing the intensity of the gunfire , predicts the death toll will rise . Protesters attacked in Maaret al-Nouman , witnesses say . More than 3,800 Syrian refugees have fled to Turkey . Syrian families chant `` Thank you , Erdogan ''