Calcutta, Dec. 4 :    Calcutta, Dec. 4:  At least four persons were injured on Sunday night after two groups clashed over the supply of building materials in Tiljala, in the city's southern fringe. Both groups fired and hurled bombs at each other. Five persons have been arrested. Trouble broke out on Sridhar Roy Road, where a multi-storeyed building is coming up. At around 10 pm, some local youth chased materials supplier Dilip when he came to the site. They asked him to leave and threatened him with dire consequences if he returned. They told him they would supply building materials henceforth. Dilip returned after a short while with some armed youth, who started hurling bombs immediately after alighting from a taxi. On hearing the bombs go off, the local goons stepped out with bombs and pistols and started retaliating. Both the groups were then locked in a bitter fight, breaking the silence of the night. Javed Khan, local Trinamul Congress councillor and member, mayor-in-council (health), said on Monday: 'Both groups that clashed on Saturday belonged to the CPM. They have created hell in the area with the help of local goons.' However, a local CPM leader, who denied the allegation, said: 'None of our party members was involved in this clash. The area was quite peaceful but trouble started erupting only after the recent Calcutta Municipal Corporation elections.' Aloke Sen, a local resident, said the spurt in clashes in the area was rooted in the rivalry among several groups of anti-socials. These anti-socials, who allegedly roam the area as 'promoters', supply building materials of inferior quality and anyone who fails to buy from them is threatened with dire consequences. Jugal Kishore Mukherjee, officer-in-charge of Tiljala police station, said: 'Dilip was quite new in this profession. He was trying to capture the area with the help of his henchmen. We have already arrested five persons involved in this incident and hope to arrest the rest within a day or two.' ail services resume: Rail services on the stretch from Bandel, Katwa, Salar, Karna Subarna to Azimgunge, on Eastern Railway's Howrah division, will be restored from Tuesday morning. The ER authorities have checked the rail tracks by running empty rakes on Monday. The Bandel- Katwa-Azimgunge section was seriously affected in the recent floods.