The main accused was identified as M Sivakumar (40), who has 23 cases, including four murder charges, pending against him. His aides, E Rajkumar (24), R Harikumar (35) and R Arun (31) of Mylapore, were also arrested, said the police. A country-made pistol with a bullet, eight machetes, Rs 50,000 in cash and jewels were seized from them.