A DHS official said there was "no indication of malicious action" in the outage, which occurred during President Joe Biden's State of the Union address to Congress.

The outage appeared to last less than half an hour.

Other government websites including those of Immigration and Customs Enforcement, the Federal Emergency Management Agency and the Secret Service also experienced temporary outages.

(Reporting by Jasper Ward and Daniel Trotta; editing by Rami Ayyub)