ISIS claims responsibility for attack in Istanbul

Islamic State claimed responsibility on Monday for a New Year's Day mass shooting in a packed Istanbul nightclub that killed 39 people, an attack carried out by a lone gunman who remains at large.

The attack, it said, was revenge for Turkish military involvement in Syria.

"The apostate Turkish government should know that the blood of Muslims shed with airplanes and artillery fire will, with God's permission, ignite a fire in their own land," the Islamic State declaration said.