Barack Obama in White House meeting with police and activists

US president Barack Obama has met elected officials, law enforcement leaders and members of the Black Lives Matter movement with the goal of getting them to work together to curb violence and build trust.

Mr Obama has devoted much of the week to the issue of violence by and against police, days after a black Army veteran killed five officers in Dallas, Texas, in revenge for the police shooting of black men in Baton Rouge, Louisiana and the Minneapolis suburbs.