LONDON- Interactive Brokers said "technical difficulties" were causing an outage on its trading systems on Monday, affecting traders who were using its platform.

With just 15 minutes remaining for U.S. stock markets to open, the brokerage firm said on Twitter that it was working to restore services.

(Reporting by Thyagaraju Adinarayan; Editing by Saikat Chatterjee) ((thyagaraju.adinarayan@tr.com; +44 20 7542 7015; Reuters Messaging: thyagaraju.adinarayan.thomsonreuters.com@reuters.net; Twitter @thyagu))