They are Pankaj Mandal, owner of Love Touch Band Show (LTBS), Jamal, Shaheen and Sunny, three members of LTBS, and Hasan, a friend of picnic organiser Jamil.

Police nabbed them raiding different parts of the capital including Farashganj and Gandaria.

They are being quizzed and not shown arrested till yesterday.

"Interrogation is going on and none is shown arrested as yet," said Ibrahim Fatemi, police super of Dhaka.

Police is also looking for Jamil.

Meanwhile, the deadline for the probe-body to submit its report has been extended.

The body formed on May 5 by the Bangladesh Inland Water Transport Authority (BIWTA) quizzed twelve people including picnic-goers and witnesses yesterday.

"The report will be submitted next week," said Sayed Lokman Ahmed, head of the four-member committee.

Sources said the committee in its report has mentioned that the incident was the outcome of luring youths to anti-social activities.

"Anti-social activities caused the Friday night chaos at Sadarghat," said Motahar Hossain, director of BIWTA.

In the report, the role of Ansar on the night was defined as a move to calm down the feuding situation, the sources added.

It also recommended punishment for persons responsible for the incident, and cautionary measure prior to granting permission to picnic organisers in future.

Meanwhile, the family members of the dead, most of whom are under severe financial crisis, do not know where to turn up to demand compensation for their loss.

They requested the journalists to bring their situation to the notices of the authorities concerned.