Former PTI minister Murad Saeed's brother Kaleem Saeed was arrested in connection with May 9 incidents, the 24NewsHD TV channel reported.
Murad Saeed has been in hiding since May 9, sources in the police said.
Meanwhile, police raided the house of PTI Karak leader Inayatullah in connection with May 9 incidents.
However, Inayatullah could not be arrested. He is too at large after May 9.