Nancy Pelosi in hospital in Luxembourg after suffering injury during trip

The 84-year-old's office said she was "currently receiving excellent treatment from doctors and medical professionals" after she "sustained an injury", but did not give any further details.

The AP news agency reported Ms Pelosi tripped and fell while with a congressional delegation in Luxembourg marking the 80th anniversary of the Battle of the Bulge, the last major German offensive campaign on the Western Front during the Second World War.

Ms Pelosi's office said she would be unable to attend the remainder of events on her trip and "looks forward to returning home to the US soon" but added that "she continues to work".

Republican congressman Michael McCaul, who was also on the trip, posted on social media that he was "praying for a speedy recovery", adding: "I am confident she will be back on her feet in no time."

Earlier this week, Senate Republican leader Mitch McConnell, 82, tripped and fell in the Senate, spraining his wrist and cutting his face.

He is stepping down from his leadership post at the end of the year.

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Ms Pelosi, who was first elected in 1987 and served as speaker twice, stepped down from her leadership post two years ago.

She has remained in Congress after being re-elected in November.

Two years ago, Ms Pelosi's husband Paul was attacked by a man with a hammer at their San Francisco home. The attacker was sentenced in October to 30 years in federal prison.

-SKY NEWS