BRUSSELS, Belgium (AP) _ The European Commission declined to comment Tuesday on a U.S. federal court ruling finding Microsoft Corp. guilty of violating antitrust laws by mounting a ``deliberate assault'' on competition in the Internet browser market.

EU spokesman Michael Tscherny said the EU executive ``does not comment on decisions by other judicial authorities. U.S. authorities are doing their job and we are doing ours.''

He also said it was too early to say if the U.S. ruling would have any impact on EU antitrust investigations of Microsoft, including a study to see if the company's Windows 2000 program gives Microsoft an unfair advantage in e-commerce activities.

On Monday, a U.S. federal judge ruled Microsoft built up a monopoly by tying its Internet browser to Windows programs.

Microsoft said it will appeal the decision.