ISTANBUL — Turkish authorities have arrested more than 20 suspects including one person who is believed to have planted a bomb that exploded on a bustling pedestrian avenue in Istanbul, Turkey’s interior minister said on Monday.

Süleyman Soylu said that initial findings indicated Kurdish militants were responsible for the deadly blast.

“The person who planted the bomb has been arrested,” Soylu said in an overnight statement carried by the official Anadolu agency and local TV stations. “According to our findings, the PKK terrorist organization is responsible.”

Another 21 suspects have also been arrested, he added.

Authorities said six people were killed and 81 were wounded in Sunday’s explosion on Istiklal Avenue, a popular street lined with shops and restaurants that leads to the iconic Taksim Square.

The Turkish interior minister also accused Kurdish forces controlling most of northeastern Syria, which Ankara considers terrorists, of being behind the attack.

“We believe that the order for the attack was given from Kobane,” he added.

Kobane has remained famous for the 2015 battle that enabled Kurdish forces to repel the so-called Islamic State (IS) group.

The city is controlled by the Syrian Democratic Forces (SDF), of which the People’s Protection Units (YPG) — allied to the militant Kurdistan Workers Party (PKK) — are a major component.

Hours after the explosion on Sunday afternoon, Vice President Fuat Oktay visited the site to give the latest death and injury toll, and promised to resolve the matter “very soon”.

The area, in the Beyoglu district of Turkey’s largest city, had been crowded as usual at the weekend with shoppers, tourists, and families.

Video footage obtained by Reuters showed the moment the explosion occurred at 16.13 local time (14.13 CET), sending debris into the air and leaving several people lying on the ground, while others stumbled away.

Hundreds of people fled the historic Istiklal Avenue after the blast, as ambulances and police raced in.

Authorities later said a government ministry worker and his daughter were among the dead. Five people were in intensive care in hospital, two of them in a critical condition.

Nobody has claimed responsibility for the blast.

Turkish President Recep Tayyip Erdogan called the blast a “treacherous attack” and said its perpetrators would be punished.

“Efforts to defeat Turkey and the Turkish people through terrorism will fail today just as they did yesterday and as they will tomorrow,” the president told a news conference before flying to Indonesia for a summit of the Group of 20 leading economies.

“Our people can rest assured that the culprits... will be punished as they deserve,” he said, adding that initial information suggested, “a woman played a part” in it.

“It would be wrong to say this is undoubtedly a terrorist attack but the initial developments and initial intelligence from my governor is that it smells like terrorism,” he added.

Justice Minister Bekir Bozdag was quoted by state-run Anadolu as saying a woman had sat on a bench for more than 40 minutes before leaving minutes before the blast, suggesting a bomb that was timed to explode or was detonated from afar.

A 23-year-old female suspect was arrested in an overnight raid by anti-terror police in the district of Kucukcekmece.

Turkish authorities say they also recovered a large sum of euros and gold coins, as well as a gun and cartridges.

Sunday’s explosion was a shocking reminder of the safety concerns that stalked the Turkish population during years when such attacks were common.

The country was hit by a string of bombings between 2015 and 2017, some by the Islamic State group, others by Kurdish militants who seek increased autonomy or independence.

Twin bombings outside an Istanbul football stadium in December 2016 killed 38 people and wounded 155 others. The attack was claimed by an offshoot of the PKK, which is designated a terrorist group by Turkey, the European Union, and the United States.

Condemnations of the attack and condolences for the victims rolled in from several countries. On Twitter, European Council President Charles Michel sent condolences to victims after the “horrific news”.

NATO Secretary General Jens Stoltenberg also sent his “thoughts and deepest condolences to all those affected and to the Turkish people.” — Euronews