MOSCOW, May 20 (Reuters) - Two trains collided near Moscow on Tuesday, causing casualties, Russia's Emergencies Ministry said.
"Keep calm, do not panic," the ministry said in a statement, providing no casualty figure.
Itar-Tass news agency said the collision was between a freight train and a passenger train. Media reports of deaths could not immediately be confirmed.
Reporting by Vladimir Soldatkin, Editing by Timothy Heritage