Turkish officials have identified one of the two suicide bombers who targeted a peace rally in the capital Ankara, with media saying his brother died as a suicide bomber in a previous attack.

The Ankara chief prosecutors office identified the bomber involved in the October 10 attacks, which killed 102 people, as Yunus Emre Alagoz. Authorities are still trying to identify the second attacker.

Turkish media reports say Alagoz's brother blew himself up in a town near the border with Syria in July, killing 33 people.

The two brothers reportedly belonged to a Turkish cell of Islamic State.

The prosecutor's statement said authorities have seized arms, hand grenades and large amounts of ammonium nitrate and other materials used to make bombs.