The United States on Wednesday said it was troubled by a recent rise in attacks in Syria, a day after a blast in the northwest town of al-Bab killed at least 11 people.
"The United States strongly condemns the terrorist attack near a crowded traffic circle in al-Bab yesterday," U.S. State Department spokeswoman Morgan Ortagus said in a statement, adding that other reports indicated more than 20 people were killed.
"We are deeply troubled by the rise in such terrorist attacks in recent months."