An Anti-terrorism Squad (ATS) from Maharashtra on Monday visited several places in Bhatkal in Uttara Kannada district and questioned some persons as part of the investigation into the July 13 serial bomb blasts in Mumbai.
Another ATS team is also in the city, police said.
The team will question members of Indian Mujahideen, who are lodged in the central jail here, as they had been arrested in connection with the serial blasts here in 2008.
Teams from ATS and National Investigation Agency have fanned out to different places in the country after the blasts that left 19 dead and injured over 130.
Besides Karnataka, different teams have left for Gujarat, Delhi, Andhra Pradesh and West Bengal.
Bangalore Police commissioner Jyotiprakash Mirji said a team of Karnataka ATS had left for Mumbai to assist the investigating officers, he said.
"These exchanges (of police teams) happen whenever there is a need. We send our teams to different places and other police forces send theirs to the city as part of investigation process. Our cooperation with other police forces is total," he said.
"Police will be looking at all angles in this probe and we will cooperate with other police teams. Exchange of visits from police teams will keep happening," he said.
The city had been under the scanner earlier as members of IM were suspected to have taken refuge here at different times.