LUXEMBOURG (AP) _ A bomb damaged a Luxembourg telecommunications center, causing extensive damage and severing phone lines, but inflicting no injuries, police said Saturday.

The explosion occurred late Friday and cut international circuits, isolating parts of Luxembourg for many hours, said a police officer who spoke on condition he was not to be identified.

There was no immediate claim of responsibility. The policeman said the bombers forced their way through an armored door into the downtown building and placed explosives near the cables.

One hour before the explosion, a bomb squad defused another device made of dynamite in the wooded Grunenwald area three miles northwest of the capital, the officer said.

During the past two months, five bombs have exploded in this small nation of 365,000, squeezed among Belgium, West Germany and France.

P-PX-07-06-85 1226EDT