A member of girl group Fifth Harmony has been charged with possession of marijuana at a US airport.

Lauren Jauregui, 20, was allegedly caught with the drug at Washington Dulles International Airport on Tuesday.

TMZ reported that the American singer was stopped at a checkpoint when a security officer found what appeared to be a bag of marijuana in her carry-on luggage.

Lauren Jauregui (centre) has been charged with marijuana possession (Owen Sweeney/AP)

A spokesman for the airport confirmed Lauren had been charged with possession of marijuana and released on summons.

Lauren's lawyer issued a statement to deny earlier reports that the singer had been arrested at the airport.

Dina LaPolt said: "Lauren Jauregui was not arrested and detained as reported, but simply given a citation for possession of marijuana and released on her own recognizance.

Fifth Harmony performing in Washington on Monday (Owen Sweeney/AP)

"She will address the matter appropriately through the legal system. This will not interfere with any future scheduled performances or activities."

A post on the official Twitter account of Fifth Harmony said the band were due to perform at the Vevo Fun Pop festival in Brazil on Wednesday.

Fifth Harmony formed in 2012 on the American version of The X Factor, which Simon Cowell appeared on as a judge.

Back to Brazil for @vevo_brasil Fun Pop Festival ??? catch us live streaming tomorrow on https://t.co/b0XeVPoNHh#fifthharmonynobrasil -- Fifth Harmony (@FifthHarmony) December 13, 2016

Lauren and her four bandmates - Ally Brooke, Normani Kordei, Dinah Jane and Camila Cabello - had originally auditioned as solo artists and finished third on the show as a group.

They have scored five UK Top 40 singles, including Work From Home which reached number two earlier this year, and brought their 7/27 world tour to the UK in October.