According to state news reports, President Vladimir Putin said investigators are considering various causes, including terrorism.
Ramzan Kadyrov is building a special forces training ground east of Grozny.
Investigators are searching for the cause of a train crash in the Hoboken, New Jersey station that killed one and injured more than 100.
Police shot the man dead after he injured four people.
The Democratic front-runner sent a message of support to a transgender individual who was attacked on a New York City train.
Train struck a backhoe in Chester, Pa; service suspended between Philly and Wilmington, Delaware.
The French capital was the place to be on April Fools' Day.
The suspect reportedly was seen in the airport terminal wearing a light-colored jacket and a hat.
The cause of the collision is not yet known.
Authorities are preventing migrants from seeking asylum in wealthy European countries.
Injuries were reported.
"I'm certain the train exists, but it might contain dangerous materials from World War Two," said a culture ministry authority.
Three were injured after a gunman attacked passengers on a train in northern France.
The company said it's trying to improve safety in the wake of the deadly crash earlier this month.
The lawsuit, filed in Philadelphia, cited "serious and disabling" injuries from the May 12 derailment that killed eight people and injured more than 200 others.
Amtrak restarted its Eastern Corridor service Monday after suspending it following the deadly Philadelphia derailment.
Amtrak's top official apologized for the crash, which happened just outside Philadelphia Tuesday, killing eight.
The engineer claims he "has absolutely no recollection of the incident or anything unusual."
More than 24 hours after an Amtrak train derailed and crashed in Philadelphia crews recovered another body.