Police said cases were registered against them for attempt to kidnap, unlawful assembly and criminal intimidation.
Raj, who was suspended a few months back, was in the city in search of an 'absconding' woman, a relative of one of his friends.
The woman was supposedly in the city and apparently living with a man.
Raj and the other accused followed the said man's car and then allegedly intercepted the vehicle.
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Tension prevailed after the locals recognised Raj and blocked his car, leading to police and MLA A Pradeepkumar rushing to the spot to pacify the crowd.
Police said all seven accused were being questioned.
Raj claimed he had documents of a missing complaint filed to trace the woman in question, which had been registered with police in Kollam district.
Salim Raj was suspended from service when the solar panel scam broke out when media reports surfaced that he had made and received calls from the accused Saritha S Nair.