Two 14-year-old girls have died after being hit by a train while using a foot crossing at a station in Essex.
It's thought the girls were rushing to cross the tracks to catch a train, but were hit by a second train going in the opposite direction.
An investigation is being set up to see what caused the accident at Elsenham station on Saturday.
The signals at the crossing are being tested to see if they were faulty, but reports say they were working properly.
The father of one of the girls said she had celebrated her 14th birthday only last Monday.
He said the details of what happened were still unclear.
He went on to pay tribute to his daughter: "We - her father, mother, stepmother, sister and brother and the rest of the family are devastated by her loss - we are already missing her."