A terrorist attack by three suicide bombers at Istanbul's main international airport Tuesday has left at least 39 people dead and some 239 more injured.

According to Sky News, the attackers started shooting before blowing themselves up at the entrance to Istanbul Ataturk Airport.

Reports say police opened fire on the terrorists, but the attackers then detonated the explosives they were carrying on themselves.

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Four armed men were reportedly seen running away from the terminal building after the explosions, according to Turkey's NTV channel.

1st photo from Istanbul's Ataturk airport where 2 major blasts rocked int'l terminal, leaving multiple casualties.pic.twitter.com/xhu1uMfzTS — Mustafa Edib Yılmaz (@MustafaEdib) June 28, 2016

"According to the information I was given, a terrorist at the international terminal entrance first opened fire with a Kalashnikov and then blew himself up," Justice Minister Bekir Bozdag told the parliament in Ankara.

An official told Reuters the bombers detonated their bombs before going through an X-ray security checkpoint.

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Airports in Turkey have security checkpoints at both at the entrance of terminal buildings and then again before passengers can gain access to departure gates.

Hand grenades were thrown during the attack, according to Turkish broadcaster Haberturk.

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In the wake of the violence, U.S. Republican presidential candidate Donald Trump tweeted: "Yet another terrorist attack, this time in Turkey. Will the world ever realize what is going on? So sad."

"We must do everything possible to keep this horrible terrorism outside the United States," Trump added.

Eyewitness Ercan Ceyhan told CNN Turk that he saw some 30 ambulances enter the airport after the explosions.

Flights have been diverted from the airport, which is Turkey's largest, and the third busiest in Europe after London's Heathrow and Paris' Charles de Gaulle. More than 61 million passengers traveled through it in 2015.

In recent months Turkey has suffered several attacks linked to Kurdish or Islamic State militants.