"The suspect(s) fled the scene prior to police arriving," police spokesman Lt. Terrence Blake said. "However, based on the preliminary investigation it appears this is an isolated incident."
At 1:07 a.m. Thursday, Patrol Division officers responded to 7 Midwood Road on a report of an assault, Blake said.
Officers found a male victim in the residence suffering from "serious stab wounds," he said. "Officers immediately rendered aid, to include the application of a tourniquet."
Norwalk Hospital EMS transported the victim to Norwalk Hospital.
The Norwalk Police Department's Crime Scene Unit is processing the scene, and Norwalk Detectives are investigating.
Midwood Road is in a residential neighborhood off West Rocks Road north of the Merritt Parkway.
Anyone with any information is asked to contact detectives at 203-854-3011. Anonymous tips can be left at the Norwalk Police Tip Line at 203-854-3111, sent to Norwalk police at www.norwalkpd.com or submitted by typing "NPD" into the text field, followed by the message, and sending it to CRIMES.
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