UPDATE 10:07 a.m. EST:
The Kurdish militant group TAK has claimed responsibility for the deadly bombings, the Associated Press reports.
These attacks which threaten our country's peace will never reach their goals.
UPDATE 7:19 a.m. EST 12/11:
The death toll in the two bombings at an Istanbul soccer stadium on Saturday has risen to 38, including 30 police officers with an additional 155 wounded.
WATCH | This closed-circuit footage captures the moment of the explosion.
WATCH | Turkish authorities respond to two explosions in Istanbul
Two explosions hit Saturday night outside a major soccer stadium in Istanbul, and Turkish authorities say about 20 police officers have been wounded.
Police cordoned off the area as smoke rose from the newly built Besiktas Stadium. Witnesses said gunfire could be heard in what appeared to have been an armed attack on police. The private NTV channel said the target of the attack was a bus for riot police.
There was no immediate claim of responsibility for the attack. This year Istanbul has witnessed bombings attributed by authorities to the Islamic State group or claimed by Kurdish militants.
Interior Minister Suleyman Soylu gave the casualty toll and said the wounded were police officers. The explosions took place after the home team Besiktas beat visitor Bursaspor 2-1 in the Turkish Super League.
(The Associated Press contributed to this report)
The sound of the explosion was captured on television.
"It is thought to be a car bomb at a point where our special forces police were located, right after the match at the exit where Bursaspor fans exited, after the fans had left," Soylu was quoted as saying by Turkey's state-run Anadolu Agency. "We have no information on the number of dead. God willing, we hope there won't be any. The wounded are police."
Television images showed more than a dozen ambulances on a street hugging the stadium and a police helicopter flying overhead with its searchlights on. The window glass of nearby buildings was shattered by the blasts and coated the pavement.
Bursaspor said none of the wounded were fans and issued a statement saying "we wish a speedy recovery to our wounded citizens."
Prime Minister Binali Yildirim and Istanbul Governor Vasip Sahin were notified of the attack, Anadolu said.
WATCH | Two men react to a blast near a soccer stadium in Istanbul