Turkey's state-run news agency says police have launched a new wave of raids and detained 15 more police officers suspected of conducting illegal wiretaps.

The Anadolu Agency said the officers were detained Monday in raids at their homes in eight Turkish cities.

Dozens of other policemen were arrested in 2014 for allegedly illegally wiretapping President Recep Tayyip Erdogan and other officials.

The government says the officers are associated with a moderate Islamic movement led by U.S.-based cleric Fethullah Gulen, which it accuses of attempting to topple the government. It says the movement is behind a corruption probe against four former government ministers and a series of leaked recordings suggesting corruption by Erdogan and family members.

Last month, police raided media outlets close to Gulen, increasing concerns over media freedoms.