which he took himself, was posted on a pro-isis social media account. a terror tracking agency says that suggests he may have been part of a network supportive of isis or linked to the group. this comes as turkish officials tonight are furiously working to track this man down. the manhunt for this suspect, who police say killed 39 people at an istanbul nightclub, has intensified tonight. cnn is told turkish officials are checking every possible source to identify him. turkish security forces have arrested more than a dozen people. police say they have the suspect s fingerprints. they have this harrowing surveillance footage of him firing as he enters the club. but so far there s no word on his name or nationality. and nearly three days after the massacre, time is working against those tracking him. i m hoping they know a heck of a lot more than we do because, you know, three days and timing on a fugitive is very important. crossing borders, the landscape is a little rough, it s a por