Details of the alleged attack are spelled out in a Weymouth police report, which includes an account of the events written by police in Surrey, the county where the incident took place last Friday at about 4:30 a.m.

Police allege Coffey used a rock to smash a window and climb inside a first-floor bedroom where he found the woman and stabbed her. She screamed, awaking others who were asleep in the home, the report said.

The victim’s brother came to her aid, pulling Coffey off of his sister, the report said. Their father was awoken by screaming and went to his daughter’s room to help restrain Coffey, who was struck twice over the head with an iron bar by the victim’s brother, the report said.

The victim’s brother suffered a serious, but unspecified injury, while trying to restrain Coffey, the report said.

British police officials believe Coffey planned the attack and brought a knife, zip ties, and tape to the woman’s home, according to an affidavit written by Weymouth police Detective David Galvin.

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Coffey met the woman playing video games online with the Xbox system, Galvin wrote. They communicated via text messages and the mobile messaging app WhatsApp, the report said. Coffey also gave her gifts, which he demanded back after she ended their relationship on Dec. 24, the report said.

Police in Weymouth searched Coffey’s home on Lincoln Street Saturday, court records show. No one answered the door there Friday afternoon, and a message left for a relative listed in a police report was not immediately returned.

In a statement, police in Surrey said the woman and a 22-year-old man hurt in the attack were treated for serious injuries.

The statement did not name Coffey, but said police arrested a man on suspicion of attempted murder and taken to a secure hospital.