ANKARA, Turkey (AP) — Police have arrested a suspect who is believed to have planted the bomb that exploded on a bustling pedestrian avenue in Istanbul, Turkey’s interior minister said Monday, adding that initial findings indicate that Kurdish militants were responsible for the deadly attack.

Six people were killed and several dozen others were wounded in Sunday’s explosion on Istiklal Avenue, a popular thoroughfare lined with shops and restaurants that leads to the iconic Taksim Square.

“A little while ago, the person who left the bomb was detained by our Istanbul Police Department teams,” the Anadolu Agency quoted Interior Minister Suleyman Soylu as saying. He did not identify the suspect but said 21 other people were also detained for questioning.

The minister said evidence obtained pointed to the Kurdistan Workers’ Party, or PKK, and to its Syrian extension, the PYD.