Trump's crackdown on Portland protests explained

Tensions are mounting in the US city of Portland, where federal troops have been sent to end almost two months of anti-racism protests, some of them violent.

The protests began after the death of George Floyd in police custody in May.

There have been nightly rallies ever since, with clashes between protesters and police escalating in recent days.

President Donald Trump says he is trying to restore order. The approach has been criticised by local officials as an election-year ploy to try and paint his opponents as weak on law and order.