Kiara and Keyara Wecker, the Internet twin girls once at the centre of a transatlantic custody battle, were back in the United States yesterday after spending most of their lives away from their natural parents.

An 18-year-old student accused of shooting five people at his high school made a reference to the 1999 massacre at Columbine High in Colorado during class earlier this year and simulated guns with his hands, a classmate said.