Police responding to a break-in at the lower-unit of a duplex in St. Paul’s West Seventh neighborhood Wednesday night found signs of a struggle and “large amounts of blood.”

But officers didn’t find anyone inside the residence on the 400 block of North Smith Avenue, according to St. Paul police spokesman Steve Linders.

Then they heard moaning and followed it into a bathroom, where they found a 24-year-old man who lived in the home “covered in blood,” Linders said.

He told officers that the intruder was in his basement.

Police found the suspect, Craig Steven Eide, 35, suffering from multiple stab wounds as well as a deep cut on his head.

Both men were taken by ambulance to the hospital, where Eide was treated for life-threatening injuries and arrested, Linders said.

He remained in critical condition Thursday afternoon. He has not been charged.

The resident, who lives in the home with his wife, suffered non-life-threatening injuries.

The incident reportedly started with the resident calling police around 11:30 p.m. Wednesday to report a man breaking into his neighbor’s vehicle.

He called back twice more as officers were en route to his address, once to say the man had moved on to his own vehicle and then a third time to report that the intruder was now forcing his way into his house, Linders said.

The resident was inside with his wife at the time, and she told authorities the thief overheard them as they called police and proceeded to rip out their air-conditioning unit and tried to make his way inside their home. When that route wasn’t successful, he entered through the back door.

She ran upstairs to alert the neighbor who lived above them, and then hid in a closet.

Her husband later told police that he repeatedly told Eide to leave but that Eide kept threatening him, “even after he told (Eide) to take whatever he wanted as long as he just left,” Linders said.

At some point, he said Eide took off into the house. Not knowing where his wife was at the time, the resident was worried for her safety, and he and Eide “encountered each other and a struggle ensued,” Linders said.

A knife was recovered at the scene, but police don’t yet know if it belonged to Eide or the resident.

The incident remains under investigation.

Eide’s criminal history includes past misdemeanor-level convictions for theft, drug possession and domestic assault.