UPDATE: Police have arrested Sydnie Jefferson, 29, of Pittsburgh in connection with this incident.

She is charged with two counts of Aggravated Assault, two counts of Criminal Attempt Homicide, two counts of Endangering the Welfare of Children, and two counts of Recklessly Endangering Another Person.

Jefferson was transported to Allegheny County Jail.

Original incident details: 

Police are investigating after a male arrived at the Zone 2 station on Centre Ave. before 7 a.m. with his young son who had suffered a stab wound. EMS transported the child to the hospital. The father and police officers then returned to a residence in the 200 block of Dinwiddie Street where a second boy had also sustained a stab wound. He was transported to the hospital by medics. 

Both children were last reported to be in critical but stable condition. 

Major Crimes detectives are interviewing all of the relevant parties from this incident.

The investigation is ongoing. Updates will be provided when they become available.