The men with their faces masked and carrying iron pipes and inflammatory liquids barged into the office at Panampillay Nagar and allegedly broke the glass walls and damaged cars parked inside the compound, Ernakulam Range Inspector-General of Police M R Ajit Kumar said.
They left behind a letter in Malayalam stating that action was being taken against the company as it was causing pollution. The language used in the letter was of some Left Extremist group, he told reporters.
The men carried out the attack at around 8 AM while the office was yet to open for the day. Only the security personnel and housekeeping staff and two of the company employees were in the premises when the incident took place, a company statement said.
As the attackers barged in brandishing iron pipes, the security personnel could not resist. They smashed the front glass panel and the glass windows of the security office into pieces and entered the ground floor office and damaged nine desktop computers, all within minutes and threw away some handbills before they left the spot, police said.
Kumar said one of the men was heard conversing in Hindi while another in Malayalam. The security guard had told police that the attackers raised 'Maoist' slogans.
Police sounded an alert at all travel points, bus depots and railways stations besides forming a team, including members from state intelligence, to jointly investigate the incident. Forensic experts and dog squad also visited the scene of attack.
Expressing shock at the incident, Menon, denied the pollution charge made by the attackers.
Kerala High Court had last year directed police protection to the company to ensure smooth operations of its Ossein plant in Kathikudam after protests by locals alleging it was polluting the river, he said.
Established in 1979, NGIL is a joint venture between Japan's Nitta Gelatin Inc and Kerala State Industrial Development Corporation.
