Turkey has declared a national day of mourning after twin blasts killed 38 people and wounded 166 others near a football stadium in Istanbul.

The explosions happened just two hours after a match had ended in an attack thought to have been targeted at police.

At least 30 police officers were among those killed, Turkish Interior Minister Suleyman Soylu said.

He added that six of the those injured were in intensive care and 17 undergoing surgery.

One of the two explosions was thought to have been caused by a suicide bomber, Soylu said.

The suspected suicide bomber struck in Macka park, next to the city's Vodafone Arena, home to Besiktas football team, while the second explosion hit directly outside the stadium.

The car bomb was detonated by remote control, the Interior Minister added.

Mr Soylu described the blasts as a "cruel plot" and said it appeared to have been an attack on a police bus.

He said 10 people have been detained in connection with the attack.

In a statement, Turkish President Tayyip Erdogan said: "A terrorist attack has been carried out against our security forces and our citizens.

"It has been understood that the explosions after the Besiktas-Bursaspor football game aimed to maximise casualties.

"As a result of these attacks unfortunately we have martyrs and wounded."

Turkey's Transport Minister, Ahmet Arslan, called the blasts a terrorist attack on Twitter.

While Sports Minister Akif Cagatay Kilic wrote: "I condemn the cruel terror attack in Istanbul. Those attacking our nation's unity and solidarity will never win."

Turkish media reported the blast targeted a police vehicle leaving the stadium after fans had already left, following the match between Besiktas and Bursaspor.

Bursapor said none of its fans appeared to have been injured in the blast. In a statement on Twitter they said: "We have contacted our fan groups. There appear to be no injuries among our fans. We wish injured citizens a quick recovery."

"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.

"People ducked under the tables, women began crying. Football fans drinking tea at the cafe sought shelter, it was horrible."

Witnesses reported that many riot police had been seriously injured.

Turkish media reported that security forces had detonated a suspicious package outside the stadium following the earlier blasts.

Foreign Secretary Boris Johnson said on Twitter that he condemned the attack and said that the UK is "committed to working with Turkey to tackle terrorism".

There has been no immediate claim of responsibility for the attack.