Explosion heard near anti-terrorism agency in Kolkata

An explosion was heard near an office of India's federal counter-terrorism agency in the city of Kolkata Monday, police and home office officials said.
A senior police official investigating the incident said no trace of explosive had been found in the area near the National Investigation Agency (NIA) office in the eastern city.
"There was a loud explosion-like sound heard around 7 pm in the area. We reached the spot but there was no trace of any explosive," Rajeev Kumar, commissioner of Bidhannagar City Police, under which the area falls, told Reuters.
A home ministry official said nobody had been injured. The official, who asked not to be named because he was not authorized to speak to the media, said the ministry planned to send a team from Delhi to investigate.
The NIA is investigating an earlier explosion in Burdwan, near Kolkata, in October that the agency believes was a botched plot by Bangladeshi Islamist militants to kill Bangladesh's Prime Minister Sheikh Hasina.
A Kolkata court Sunday gave the NIA custody of Jamaat-ul-Mujahideen Bangladesh (JMB) commander Sajid, a Bangladeshi national who West Bengal police arrested  Saturday in connection with the blast. Sajid's arrest followed the detention of another suspect Thursday.