Feb. 25 (UPI) -- Syrian officials announced Wednesday that there was a "mass escape" last month from the country's Kurdish-controlled al-Hol camp, which held ISIS-linked families. It's believed that thousands may have escaped, CNN reported . The Wall Street Journal reported that about 15,000 to 20,000 people, including ISIS affiliates, were at large following the escape from al-Hol, citing U.S. intelligence agencies, CNN reported. The United Nations said al-Hol camp held more than 30,000 people.