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Girl, 13, accused of plotting mass shooting at US school

Tributes left near the entrance to Sandy Hook Elementary School after the massacre in 2012 Credit: Reuters

On the day America remembers the victims of one of its worst ever gun tragedies, a 13-year-old girl has been accused of plotting a mass shooting at a school.

Weapons, ammunition and "personal writings" were discovered at the teenager's home in the town of Tonkawa, Oklahoma, police said, after investigators received a tip-off that she was planning to attack the school.

She had allegedly made threats towards specific students, all of whom have been notified.

The parents of one of the Sandy Hook victims grieve after the massacre Credit: Reuters

The girl, who police say was solely behind the plot, is being held in a youth detention centre.

The allegations emerged as Newtown in Connecticut marked the fourth anniversary of the Sandy Hook Elementary School massacre.

Twenty-year-old Adam Lanza stormed into the school on 14th December 2012 and shot dead 20 children and six teachers. The gunman also killed himself and his mother.

Obama wipes a tear as he speaks about the Sandy Hook shooting in 2012 Credit: Reuters

The town held a moment of silence this morning to remember the victims and flags were lowered to half-mast across Connecticut.

The tragedy stunned America, with a tearful President Obama at the time speaking of the "overwhelming grief" at the loss of life.

But opposition from the National Rifle Association and Republican politicians has prevented the introduction of tougher gun laws since.