The head of Venezuela's opposition-controlled parliament was briefly detained days after saying he was ready to assume the country's presidency.
A video posted on social media appears to show the moment intelligent agents intercept Juan Guaidó's car in a busy road north of the capital, Caracas.
Two journalists have reportedly been detained while covering the case.
President Nicolás Maduro was sworn in for a second six-year term on Thursday. The opposition calls him illegitimate.
A country in freefall
Mr Guaidó - who said on Friday he was ready to assume the Venezuelan presidency on an interim basis - was detained while he was on his way to a political rally, opposition members said.
He is the speaker of the National Assembly, which has been stripped of powers by the Supreme Court.
The detained journalists have been named as Beatriz Adrián and Osmary Hernandez, who works for CNN's Spanish news channel.