The bodies of five children have been found in a private apartment in Solingen, Germany, police say.
Police say they suspect the 27-year-old mother of killing the children before attempting to take her own life at a train station in nearby Düsseldorf.
The victims included girls aged one, two and three, as well as two boys who were six and eight.A sixth child, an 11-year-old boy, was found alive with his grandmother.
Responding to call at about 13:45 local time (11:45 GMT), police said they arrived at the apartment building in Solingen, in North Rhine-Westphalia state, to discover the bodies of five children.
North-Rhine Westphalia interior minister Herbert Reul, said that the incident was extremely sad and said his heart went out to the children who had lost their lives at such a young age.
Police spokesman Stefan Weiand said the children's mother had been "seriously injured" after throwing herself in front of a train in Düsseldorf and was being treated in hospital under police guard.
Police said they were hoping to learn more about the "incredibly tragic occurrence" after speaking with the mother.
The entrance to the block of flats in Solingen has been sealed off and images show police cars and ambulances on streets, with forensic officers also at the scene.