A black man has been shot dead by police in the US state of Minnesota as protests continued over the police killing of a black man in Louisiana.
Philando Castile’s girlfriend live-streamed the St Paul incident’s aftermath, showing him covered in blood as an officer pointed his gun at him.
He was shot as he reached for his driving licence, she said.
It follows the death of Alton Sterling, who was shot dead by police during an incident in Baton Rouge on Tuesday.
Hundreds of people have protested for two nights over Mr Sterling’s killing.
The deaths follow a long line of high-profile incidents involving African-Americans dying at the hands of the police, igniting a national debate about the use of lethal force.
As news of the latest shooting spread, about 200 people protested outside the St Paul home of Minnesota Governor Mark Dayton, who later requested a federal investigation into the shooting.
In a statement on Facebook, President Barack Obama said all Americans “should be deeply troubled” by the two fatal shootings.
He said it was clear that they were not isolated incidents but “symptomatic of the broader challenges within our criminal justice system”.
Black US tennis player Serena Williams, who is playing at the Wimbledon tournament, also expressed her dismay at news of Mr Castile’s death, tweeting: “In London I have to wake up to this. He was black. Shot 4 times? When will something be done – no REALLY be done?!”