Police in Bangladesh said on Sunday that they have arrested a suspected Muslim militant for his alleged involvement in the killing last month of a gay rights activist and his friend in the capital.

Police identified the suspect as Shariful Islam Shihab, a former member of the banned Islamic group Harkatul Jihad. They said he joined another militant group, Ansarullah Bangla Team, in mid-2015.

Shihab, 37, was arrested in the southwestern district of Kushtia, Munirul Islam, head of a newly formed police counterterrorism unit, told a news conference. He did not give any further details.