An American soldier on temporary duty at the Yavoriv combat training center has suddenly died (presumably from a heart attack) in Lviv, Lviv Regional Administration's civil defense department has said.

"Lviv's emergency center received a message at 11:28 on December 10, 2017, that a 21-year-old American soldier had died on Lemkivska Street presumably from a heart attack. The soldier was on temporary duty to the Yavoriv training center," the message said.

The department said the man had died before emergency medical workers arrived on the scene. The corpse was taken to the region's medical forensic morgue.