An alleged Indian Mujahideen operative was arrested by the Maharashtra Anti-Terrorism Squad on Tuesday in connection with the triple blasts in Mumbai in July 2011. The accused, who is the 12th person to be arrested in the case, was nabbed at Mumbai airport, ATS officials said. Zainul Abedin, who was detained in Saudi Arabia in 2015, is believed to have supplied the explosives used in the blasts, Hindustan Times reported.

Abedin hails from Bhatkal, Karnataka, and is supposedly close with Indian Mujahideen member Riyaz Bhatkal, who is based in Pakistan. Abedin’s name came up during the interrogation of an accused from Karnataka arrested by the ATS last year.

A mixture of trinitrotoluene, ammonium nitrate and petroleum carbon oil was used to set up four bombs, which were detonated at Zaveri Bazaar, Opera House and Dadar Kabutarkhana between 6.52 pm and 7.05 pm, on July 13, 2011. The explosions killed 27 and injured 127 others. The fourth bomb planted under a police van at the Dadar flower market did not go off.