Turkish authorities have detained a brother of Fethullah Gulen, a U.S.-based cleric they accuse of orchestrating a coup attempt in July, and issued arrest warrants for 115 other people as part of nationwide investigations into the abortive putsch.

Kudbettin Gulen was taken into custody on Sunday by Turkish counter-terrorism police in the Gaziemir district of the Aegean province of Izmir following intelligence that he was staying at a relative’s house, state-run Anadolu Agency said.

The daily Hurriyet reported that Kudbettin Gulen had been abroad recently but that security services learned he had returned to Turkey and he was then detained.

Several of Gulen’s relatives, including a nephew, niece and cousins, have been arrested since the July 15 coup.

A chief prosecutor’s office in Sakarya province, 150 km (93 miles) east of Istanbul, has opened an investigation into 148 people over their suspected links to Gulen’s movement, Anadolu said. A court issued arrest warrants for 115 of them.

Police carried out simultaneous raids across 27 provinces to detain the suspects, it added.

Turkey has dismissed or suspended more than 100,000 people in the military, civil service, police and judiciary over their alleged role in the attempted coup. Some 32,000 people, including soldiers and journalists, have been arrested.

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