Attempted bombings follow another foiled attack on Tuesday
UN building attack marks the second strike this week
Short clip shows unidentified man walking around popular Istanbul square
Attacks persist despite army’s claim of clearing out Boko Haram
Carnage was retaliation for Turkey’s anti-terror efforts in Syria, Iraq
Last week’s attack in Berlin offers more evidence of ticking time bombs in the West
Justice Department wanted to designate Boko Haram a terror group in 2012
Police found Anis Amri during a routine stop
Congressional report details massive revenue streams among terrorist groups
Authorities had been investigating the man, whose asylum application was denied
