Riots erupted in the Kurdish south-east of Turkey this week after a bomb attack blamed on secret police.
The bomb killed one person at a bookstore in Semdinli said to have Kurdish rebel links.
Guns were found in the boot of a car being driven by intelligence agents, Turkish prosecutors confirmed.
Crowds took to the streets of the mountain town which has seen PKK rebel unrest in the past.
Emotions were high at the funeral of the man killed in the bookstore in Semdinli.
His coffin was draped in Kurdish colours and was followed by a large crowd.
Slogans in support of the Kurdish PKK rebels could be heard in the streets.
Semdinli walls bear graffiti in support of the PKK rebels, who ended a long truce last year.