It was a planned terror attack on Friday. "HuJI a suspect in mosque blast," from the [1] Business Standard:

Bangladesh-based terror group Harkat-ul-Jihad-al-Islami (HuJI) on Saturday emerged as the prime suspect in the blast at the Mecca Masjid in Hyderabad as investigators claimed to have made a breakthrough with the recovery of a SIM card from a phone attached to an unexploded bomb.

Eleven people were killed in the explosion that occurred during Friday prayers while five more died when police fired on protesters who attacked shops and petrol pumps in the communally sensitive Charminar area.