PHILADELPHIA (WPVI) -- Philadelphia police are investigating after they say a student was stabbed inside of Lincoln High School on Thursday morning.It happened around 9:30 a.m. on the 3200 block of Ryan Avenue.Authorities tell Action News that a 20-year-old female student was stabbed in the head with a pair of scissors by another female student.The victim was transported to an area hospital where she's listed in stable condition.Police say one person is in custody.-----