[JURIST] Indian authorities on Sunday arrested a fourth suspect in the July 11 Mumbai train bombings [BBC report] that killed over 180 people [Mumbai Police casualty list]. Authorities arrested Dr. Tanyir Ansari late Sunday after several days of questioning in connection to the bombings. The Press Trust of India [media website] reports that Ansari is an alleged operative of the Lashkar-e-Taiba [FAS backgrounder], a Kashmiri militant [BBC backgrounder] group fighting Indian control in Kashmir. Ansari's arrest follows the arrest of three men Thursday in what Mumbai police called a "big conspiracy," saying the Mumbai investigators have definitive proof that the three arrestees have connections to terrorist groups in Nepal, Bangladesh and Pakistan.

Mumbai Police Commissioner A.N. Roy said Monday that the three men arrested last week were not directly responsible for the attacks, and that authorities have not yet caught the men responsible for manufacturing and planting the bombs. Police have detained hundreds for questioning in relation to the bombs, and have named three other suspects [JURIST reports] in addition to the four already arrested. AFP has more. The Times of India has local coverage.