First a car bomb exploded outside the Vodafone Arena, home to Istanbul’s Besiktas soccer team, leaving flaming wreckage on the street. Forty-five seconds later, a suspect wearing explosives detonated them while surrounded by police in an adjacent park, Deputy Prime Minister Numan Kurtulmus told a news conference.

President Tayyip Erdogan described the blasts as a terrorist attack on police and civilians. He said the aim of the bombings, two hours after the end of a match attended by thousands of people, had been to cause the maximum number of casualties.

“Nobody should doubt that with God’s will, we as a country and a nation will overcome terror, terrorist organisations … and the forces behind them,” he said in a statement.

Bombing at Egypt’s Main Coptic Christian Cathedral Kills 25

The attack shook a soccer-mad nation still trying to recover from a series of deadly bombings this year in cities including Istanbul and the capital Ankara, some blamed on the Islamic State jihadist group and others claimed by Kurdish militants.

There was no immediate claim of responsibility. But the blasts came less than a week after Islamic State urged its supporters to target Turkey’s “security, military, economic and media establishment”.

“It was like hell. The flames went all the way up to the sky. I was drinking tea at the cafe next to the mosque,” said Omer Yilmaz, who works as a cleaner at the nearby Dolmabahce mosque, directly across the road from the stadium.

“People ducked under the tables, women began crying. Football fans drinking tea at the cafe sought shelter, it was horrible,” he told Reuters.

Turkey is a member of the NATO military alliance and part of the U.S.-led coalition against Islamic State. It launched a military incursion into Syria in August against the radical Islamist group. It is also fighting a Kurdish militant insurgency in its own southeast.

Turkey Says Wedding Suicide Bomber Was a Child

Interior Minister Suleyman Soylu said the first explosion, which came around two hours after the end of the match between Besiktas and Bursaspor, was at an assembly point for riot police officers. The second came as police surrounded the suicide bomber in the nearby Macka park.

Two of those killed in the blasts were civilians. The other 27 were police officers, including a police chief and another senior officer, Soylu said. He said 17 of the wounded were undergoing surgery and another six were in intensive care.

Soylu also said 10 people had been detained based on evidence from the detonated vehicle, but gave no indication of who the authorities thought might be behind the attack.

A Reuters photographer said many riot police officers were seriously wounded. Armed police sealed off streets. A police water cannon doused the wreckage of a burned-out car and there were two separate fires on the road outside the stadium.

For more on terrorism, watch:

Bursaspor said none of its fans appeared to have been injured. Both it and Besiktas condemned the bombings.

“Those attacking our nation’s unity and solidarity will never win,” Sports Minister Akif Cagatay Kilic said on Twitter. Transport Minister Ahmet Arslan, also writing on Twitter, described it as a terrorist attack.

NATO Secretary General Jens Stoltenberg condemned what he described as “horrific acts of terror”, while European leaders also sent messages of solidarity. The United States condemned the attack and said it stood with its NATO ally.

The bombings come five months after Turkey was shaken by a failed military coup, in which more than 240 people were killed, many of them in Istanbul, as rogue soldiers commandeered tanks and fighter jets in a bid to seize power.

Istanbul has seen several other attacks this year, including in June, when around 45 people were killed and hundreds wounded as three suspected Islamic State militants carried out a gun and bomb attack on its main Ataturk airport.