All US federal prisons in lockdown after deadly gang fight

All federal prisons in the US have been placed on lockdown after a gang fight left two inmates dead at a facility in Texas.

Two other prisoners were seriously hurt in the violence at the high security Beaumont facility on Monday, the Federal Bureau of Prisons (BOP) said.

The bureau said it was responding with "an abundance of caution", adding that the lockdown was a temporary measure.

It is rare for such a measure to apply to the entire federal prison system.

Most of America's prisoners are held in facilities...