Union Home Minister Rajnath Singh on Tuesday expressed concern over the killing of the two Dalit children in Faridabad and asked Haryana Chief Minister Manohar Lal Khattar to ensure security to everyone."The home minister expressed concern over the killing and asked the Haryana chief minister to ensure security to everyone and prevent any recurrence of such incident," an official said."In a telephonic conversation with the chief minister, the home minister also sought a report from the state administration," the official added.Two children were burnt alive while their parents were reported to be critical when the house of a Dalit family in Faridabad district was set on fire on Tuesday.