A 14-year-old East Boston teen was jailed without bail after allegedly stabbing another 14-year-old girl near school, prompting a broader investigation.

A 14-year-old in East Boston has been held without bail after allegedly stabbing another 14-year-old girl near East Boston High School on September 24. The victim, who suffered stab wounds including a punctured lung, said she was followed by two teens and attacked with a folding knife. She reported a prior conflict with one suspect over broken eyeglasses. Surveillance and cellphone videos helped identify the accused, who faces charges including assault to murder and assault with a dangerous weapon. The victim was treated by school staff and police. The second suspect is expected to be arraigned later. The case remains under investigation.