Istanbul, June 29 (RHC)-- At least 41 people have been killed and 147 more injured in a gun and bomb attack in Istanbul's Atatürk international airport.  Late on Tuesday night, three terrorists blew themselves up as security forces were trying to block their progress into the airport.

According to Turkish officials, police forces started firing at suspects when they tried to pass the international terminal's entry, before the security check.  A few hours after the attack, Turkish Prime Minister Binali Yildirim announced that early signs suggested that the Daesh Takfiri terrorist group was behind the bombings.

All flights at the airport have been canceled until further notice.  And Turkish Prime Minister Binali Yildirim declared Wednesday a National Day of Mourning for those killed in Tuesday's bombing attack in Istanbul.

Following an emergency meeting with Yildirim and security and military officials, Turkish President Recep Tayyip Erdogan released a statement, calling on the intentional community to show a "decisive stance" against terrorism.

Iranian Foreign Minister Mohammad Javad Zarif also condemned that attack and called for global unity in the war against terrorism.  “Terror rears its ugly head yet again in our friend & neighbor’s airport.  Extremist violence is a global threat; we must confront it together,” he tweeted early on Wednesday.

British Foreign Secretary Philip Hammond released a statement saying he was "shocked by the attack in Istanbul," adding that "thoughts are with those affected. We stand ready to help." 

The attack was also condemned by UN Secretary General Ban Ki-moon, who also called for stepped-up cooperation in the battle against terrorism.