Jimmy Fallon managed to escape unharmed after he was reportedly caught up in a bar fight in New York City on Thursday night.

The Tonight Show host is said to have joined a group of friends and colleagues for a post-work outing at Manhattan bar Niagara when a brawl broke out among other patrons.

Jimmy Fallon and his group were caught up in the chaos, but managed to escape without injury, according to the New York Post.

Jimmy Fallon is said to have joined a group of friends and colleagues for a post-work outing at Manhattan bar Niagara when a brawl broke out among other patrons (photo NBC)

“Fallon was pretty shaken up,” a source close to him told the New York Daily News.

“He was at the wrong place at the wrong time, and chaos erupted around him.”

The popular rock club in East Village is operated by area musicians, including solo artist Jesse Malin and Johnny “T” Yerrington, who has drummed with Ryan Adams’ band. The grungy Avenue A hot spot is marked by an exterior mural of former Clash front man Joe Strummer with the caption “The future is unwritten”.

A source close to Jimmy Fallon, 39, said he stopped by Niagara just as a band was wrapping up and the fight was breaking out.

A witness said Jimmy Fallon was peripherally involved in the 10:30 p.m. imbroglio, but his connection to the combatants, if any, remained unclear.