Protests are spreading across Ecuador over controversial free-trade talks between the government in Quito and the US.

The protests are led by indigenous communities, who have been blocking major roads with rubble and burning tyres.

They say a trade agreement will affect their livelihoods and are pressing for a referendum on the issue.

US President George W Bush has become one of the main targets for protesters.

The four-day protests have disrupted deliveries of some basic food in several provinces, and are starting to hurt the economy.

There have been reports of clashes with police deployed to guard major roads, including the Pan-American highway.

President Alfredo Palacio has denounced the protests, saying they aimed to "tear apart the nation".