TOULOUSE (AFP)--Angry French workers besieged a car parts factory Thursday after the U.S. owners accused a group of employees of assaulting a manager and shut down the plant.

Executives at Molex Inc. (MOLXA) cited security reasons for the closure of their factory in Villemur-sur-Tarn, near the southern city of Toulouse, and lodged a police complaint against four workers over the incident.

Molex Chief Executive Martin Slark also accused French police of failing to respond to calls for assistance when manager Eric Doesburg and two security guards were allegedly attacked late Tuesday.

About 40 workers allegedly kicked and punched Doesburg following a meeting of the factory's works council to discuss layoffs, but a union official said the manager "did not receive any blows, just eggs."

Doesburg is based in the U.S. and was in France for talks on the fate of the 283 workers when the plant shuts down for good in October and production is relocated to the U.S.

"We will not compromise on the safety and well-being of our employees," Slark said in a statement issued from Molex headquarters in Lisle, Illinois.

"We are very concerned not only by the violent actions of some employees at this site but by the complete lack of support from law enforcement authorities when people were being physically attacked.

"This is not acceptable and we are prepared to take whatever action we think is necessary to ensure both the safety of our employees and the security of our plant."