Two young children were fighting for their lives after they were stabbed in a Bronx apartment Saturday night, law enforcement sources said.

The kids, believed to be 3-years old and 11-months old, were each stabbed in the neck with an unknown sharp object inside of an apartment building at 246 Echo Place in Mount Hope around 8 p.m., sources said.

The two victims were transported by EMS to Columbia Presbyterian Hospital in grave condition, sources added.

Police have taken a person of interest into custody, sources said. No charges have been filed at this time.