An 11-year-old girl was allegedly stabbed in what investigators have called a “horrific” and seemingly random attack at a popular London tourist site. The juvenile victim suffered serious, non-life-threatening injuries Monday morning in Leicester Square, according to the UK’s Metropolitan Police Department. The girl’s 34-year-old mother was also non-fatally injured in the attack. Authorities arrested an unidentified 32-year-old male suspect on the scene. “I would like to pay tribute to the members of the public, including staff from local businesses, who bravely intervened in this incident,” D…