At least four people, including two children aged 12 and 15, were killed when a train collided with a school minibus carrying seven children in northern Belgium on Tuesday, officials said. The victims also included the bus driver and an adult accompanying the children, according to RTL TV, which cited Transport Minister Jean-Luc Crucke. What do we know about the accident in Belgium? Crucke said two other people were severely injured in the accident, which occurred on a level crossing near the town of Buggenhout, some 23 kilometers (about 14 miles) from the capital, Brussels . Security cameras showed that the crossing's security barriers had come down, Crucke said, something confirmed by railway infrastructure operator Infrabel.…