"We have sounded an alert and are determined to strictly stop any violence following the incident. If required, we will do it ruthlessly," Assam Director General of Police Mukesh Sahay told reporters here.
The attack was allegedly carried out by Nikhil Bharat Bengali Udbastu Samanvay Samiti (NBBUSS) on March 6 and protests by various organisations erupted across the state following the incident.
The special investigating team (SIT) is headed by CID Senior Superintendent of Police Raja Martandan and will investigate the incident, he said adding anyone found guilty will be firmly dealt with as per law.
The situation, he said, has been brought under control by senior officials camping at the site and additional security reinforcements who were rushed there.
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Fourteen companies of Assam Police battalion along with 80 additional constables have been deployed in Silapathar, where the AASU office is located, while some companies of paramilitary forces have been shifted from Jorhat and North Lakhimpur to Silapathar.
"The army too has been kept on standby and their help will be sought in case of need," the DGP said.
"Deputy Commissioners of all districts have been directed to ensure that no untoward incidents take place and if required additional security reinforcements will be rushed if tense situation prevails in any place," he added.
NBBUSS members and supporters had on March 6 organised a
meeting at Silapathar demanding Indian citizenship for Hindu migrants from Bangladesh.
After the meeting its members took out a procession and then allegedly attacked an AASU office near NH15(B), ransacked and damaged its furniture and injured three members of the students union.
A bandh was also called in Upper Assam's Dibrugarh district.
The DGP said that protests against such an incident are natural but the situation is being "monitored closely".
A few stray incidents of violence have been reported from some places but these were immediately brought under control, he said and appealed to the people to maintain calm and not give credence to rumour mongering.
"I thank people for not being swayed by provocation. People and organisations irrespective of their linguistic, religious and political affiliations have condemned the incident," he said.