Three British schoolgirls who flew from London to Istanbul in mid-February have reportedly been seen on security footage catching a bus to Syria. The three girls, Amira Abase, 15, Shamima Begum, 15, and Kadiza Sultana, 16, are believed to be on their way to join ISIS. Both the families of the girls and the British police have issued multiple pleas for the girls to return. Prime Minister David Cameron has claimed that the girls were radicalized “in their bedrooms” and that social media firms need to do more to curb online extremism. The CCTV pictures are from February 17 and 18. There have been an estimated 600 British Muslims who have traveled to the region to take part in the conflict, some of them with ISIS.