Police Sunday said the probe into the terrorist attack at the Indian Institute of Science in Bangalore was moving "in the right direction" and they were "very confident" of cracking the case.

"The investigation is progressing in the right direction. We are satisfied. We have made good progress," Bangalore Police Commissioner Ajay Kumar Singh told PTI.

• Terror attack at IISc, Bangalore; 1 killed, 4 injured

Singh said the police was "very confident" of detecting the case "as soon as possible", but could not set any deadline considering the "seriousness" of the incident.

He said several people had been questioned, but none had been arrested. Describing the progress as "good", he said, "We should succeed (in detecting the case)."

Asked about the possible link of terrorists involved in the attack on the Special Task Force office in Hyderabad in October to the Bangalore terrorist strike, he said a team from Bangalore was in the Andhra Pradesh capital, but "no conclusion has been drawn (linking the two)".

The Delhi police had recently arrested three Harkat-ul-Jehad militants for the Hyderabad blast.

The city continued to remain on high alert following Wednesday's IISc attack that left a retired professor of the Indian Institute of Technology, Delhi, dead and four others injured.

Shrugging off fears of fresh terrorist attacks, Bangaloreans late Saturday night ushered in the New Year with the usual revellery associated with it as nearly 4,000 policemen, aided by the "quick reaction forces", including a team from the army, and bomb disposal squads kept strict vigil.