Authorities in the US state of Connecticut are investigating a possible threat against President Obama, according to local media reports.
A statement from the US Secret Service, which oversees the President's personal security, said: "Information has been received by law enforcement regarding a potentially suspicious person and vehicle. We are working with our local law enforcement partners to determine the validity of the information provided."
A local newspaper said state police were looking for a man who had allegedly made a threat against Obama.
He was believed to have been driving a car with Connecticut licence plates.
Obama was making a number of fundraising appearances in the north-east of the country on Friday.
More top news
Lawyers for Mohammed Emwazi's father have told ITV News there's no evidence his son is IS killer 'Jihadi John' as "his face is covered".
Another cold night on the cards with freezing, frosty and for some of us icy as the temperatures slip away in the next few hours.
A three-time Yarl's Wood detainee tells ITV News about her experience at the detention centre in Bedfordshire.