The government said Friday it is investigating U.S. suspicions that German companies have broken U.N. sanctions against Iraq over its invasion of Kuwait. One German firm denied the allegations.

Washington has given Bonn a list of 50 German companies suspected of violating the embargo against Iraq, the news magazine Der Spiegel said.The magazine said the information came from U.S. wiretaps of "Iraq's overall telephone traffic and intercepting Telefax messages." It did not identify its sources.

The Bonn government confirmed it received a list of suspected embargo violators and that the allegations were being examined.

But government spokesman Dieter Vogel said so far no proof had emerged that any of the companies made deliveries in violation of U.N. sanctions.