Armed intruder arrested on Windsor Castle grounds as Queen Elizabeth and royal family celebrated Christmas

An armed intruder was arrested on the grounds of Windsor Castle on Christmas Day, police said. Queen Elizabeth and other members of the royal family were celebrating Christmas at the castle. 

Officers responded to reports of a security breach around 8:30 a.m. local time, according to police. Thames Valley Police Superintendent Rebecca Mears said in a statement that security protocols were initiated "within moments of the man entering the grounds." The suspect, a 19-year-old man from Southampton, did not enter any buildings, she said.

He remains in custody and an investigation is ongoing.