There is still some confusion about events, but this is now known:

The intruder got in by breaking the back door of the house.

Nancy Pelosi was in Washington, D.C., with her protective detail.

There were no security personnel at the Pelosi home.

Paul Pelosi told the intruder that he had to use the bathroom, then made a surreptitious 911 call on his cellphone and left the line open

Dispatcher Heather Grimes could hear Pelosi talking to his attacker and alerted officers to the scene.

Police got to the house in about two minutes.

When officers arrived and knocked on the front door the door was opened. The officers saw Paul Pelosi and DePape, the alleged intruder, “each with one hand on a single hammer”.

After officers ordered both men to drop the hammer, DePape “immediately” pulled the tool from Pelosi and “violently attacked him with the hammer”.

Police tackled the assailant, grabbed the hammer and took him into custody before calling for backup and beginning first aid.

A source who was briefed on the attack said the assailant confronted Paul Pelosi and shouted, “Where is Nancy? Where is Nancy?” before the assault occurred.

Paul Pelosi was treated in hospital for a skull fracture and damage to his arm and hands. He is expected to make a complete recovery.

I thought this would be useful as some of the previous comments got rather wild and wooly.