FBI says it warned about prospect of violence ahead of Capitol riot

Supporters of President Donald Trump are confronted by US Capitol Police officers outside the Senate Chamber inside the Capitol in Washington (Manuel Balce Ceneta/AP)

The FBI warned law enforcement agencies ahead of last week’s breach of the US Capitol about the potential for extremist-driven violence, officials have said.

The message contradicts earlier statements that law enforcement was caught off guard by the assault by supporters of President Donald Trump.