German auto component maker Bosch India Ltd shut down its Bangalore plant till its workers stopped their 'tool down' strike they went on Wednesday without prior notice.

In a regulator filing to the stock exchanges Friday, the listed company said that efforts were on to resolve the labour issues to restore normalcy at the earliest date.

"Union and workmen of the Bangalore plant have commenced a 'tool down' strike from first shift of Sep 28, without giving prior notice to management. In view of the illegal and unjustified strike, the management has decided to shut down the plant operations from late Thursday," the company said in the filing in Bangalore.

The Adugudi plant employees' union said the workmen went on 'tool down' strike to protest the company's policy to outsource more work than from the plant, endangering their job security.

"We fear that at this rate, the management may terminate services of many workers as more job works are being outsourced by the company from the plant," the Mico Employees' Association said in a statement.

The management, however, clarified that its outsourcing initiative had not resulted in a job loss as it was a common practice followed by the company and the industry as part of modernisation to maintain competitive edge.

About 2,400 workers are employed in the Bangalore plant.