The Kerala Police on Tuesday released seven SDPI (Social Democratic Party of India) members who were arrested in connection Abhimanyu murder case. The police released them after the SDPI members conducted presser at Ernakulam Press Club. Abhimanyu was a student of Maharaja’s College and a SFI activist. He was hacked to death in Kochi. Later, the police officials raided at different locations in Ernakulam district. A few people have also been arrested in the case who were PFI sympathisers, say sources.