Turkish police arrested two more people on Friday for their suspected links to Monday's U.S. Embassy drive-by shooting in capital Ankara, according to a police source.
Friday's arrests raise the total number of arrestees to four.
The suspects are currently being interrogated by police, the source said.
The detention period for Ahmet Celikten and Osman Gundas, the suspects arrested on Monday, was extended, it added.
According to the Ankara Governor's Office, Celikten and Gundas confessed to their involvement in the attack.
On Tuesday, Turkish security forces said the suspects were drunk at the time of the attack.
