Security has been increased at metro stations across Los Angeles after what is being described as a "specific" threat of a terror attack today.
In an anonymous call to authorities, a man threatened to blow up Universal City station.
The station is less than a kilometre from the Hollywood Universal Studios theme park.
Los Angeles County sheriff Jim McDonnell said: "We received this threat this morning.
"We've been running this to ground all day long. This could be real or it could be a hoax, but we must remain calm but vigilant."