Thousands of demonstrators have protested the economic policies of conservative Ecuadorian President Guillermo Lasso, days after he raised petrol prices, blocking roads in some parts of the country.
Lasso, a former banker who took office in May, last week scrapped planned incremental rises in petrol charges, meant to eventually align with international costs, following pressure by indigenous and other organisations.
He opted instead to raise the price of gasoline extra, a higher octane petrol that is Ecuador's most-used fuel, to a fixed $A3.40 a gallon and diesel to $A2.53 a gallon.
But unions and other groups want Lasso to freeze prices at lower rates and exempt sectors hit hard by COVID-19.
Five police officers were injured and two members of the armed forces were being held on Tuesday by a community in northern Quito, but were unharmed, Defence Minister Luis Hernandez told journalists.
Thirty-seven people were detained for blocking roads, he added.
The Ecuador Confederation of Indigenous Nations said demonstrators had been injured but did not give a figure.
Interior Minister Alexandra Vela said marches were peaceful except for a few incidents in the afternoon and said the government was open to dialogue.
Petrol costs have risen significantly since Lasso's predecessor, Lenin Moreno, began monthly increases in May 2020.
Police used tear gas in the capital amid small clashes with protesters, while officers on horseback blocked the entrance to the plaza that had been the marchers' destination.
Marches also took place in Guayaquil and Cuenca.
Indigenous groups blocked the road that connects Quito to the country's north with earth and trees, and others in various Andean provinces were closed.
Indigenous organisation CONFENIAE said some roadways in the Amazon region had been shuttered from the early morning.
"We didn't come to destabilise, we came to make economic demands of the government," CONAIE president Leonidas Iza told demonstrators in Panzaleo.
Australian Associated Press