An Improvised Explosive Device (IED) was reportedly used in the bomb blast that occurred 100 metres away from the BJP's office in Bangalore on Wednesday.

The explosive device was kept on a motorcycle when it exploded on Wednesday morning.

According to NDTV, police have said that 2kgs of Grade 1 explosives were used in the blasts. Police are now investigating CCTV footage from the BJP offices for clues. Sources said that a person was spotted going into a shop and then leaving. However, it is not confirmed whether it is the same person who placed the explosive on the bike.

Police Commissioner of Bangalore, Raghavendra Auradkar, said that the explosive was kept on the motorcycle that was parked around 100 metres away from the BJP's office in Malleshwaram locality at around 10:15 am.

According to Times Now channel, intelligence agencies had warned Karnataka police of a potential attack in Bangalore. However, the channel also said that the warning was a general one and did not give details about where the attack would take place.

Following Bangalore blasts, an alert has been sounded across Gujarat.

"We have sounded alert to police commissioners and district police heads in the state following the bomb blast in Bangalore," state police chief Amitabh Pathak said.

 At least 16 people, including eight policemen and eight civilians, have been injured in the blasts, but nobody is critical. The injured have been rushed to the KC Hospital.

A National Investigating Agency (NIA) team and forensic experts are investigating the scene.

BJP President Rajnath Singh called the incident as unfortunate.

R Ashok, Karnataka Home Minister, said that the blast was targeted at the BJP, senior leaders and workers.

"It is a very clear act of terror--it is targeted at the BJP, our senior leaders and workers," said Ashoka. "100 per cent, it is targeted at BJP workers".