A woman found dead in her Hull home had been attacked with an axe and suffered "severe head injuries" police said.
The body of 65-year-old Irene Robertson was found in a flat in Euston Close, off Anlaby Road, by officers from Humberside Police on Sunday.
Officers were called to the property in in the early hours of Sunday after reports of a disturbance.
A 17-year-old youth has been arrested on suspicion of murder and was being questioned by detectives.
Officers who were called to the scene found a door had been damaged and Ms Robertson's body was found inside. She had suffered serious injuries.
A post-mortem examination was expected to be carried out later, Humberside Police said.
Weapon seen
The scene was cordoned off while forensic examinations were carried out.
Police said they wanted to trace a number of witnesses who approached police officers in the Bean Street area at about 0230 GMT and reported seeing a male with a weapon.
They said they also wanted to speak to a group of about five young people on bicycles who may have seen the suspect in Anlaby Road at about 0220 GMT and moved out of his way.
Senior investigating officer Det Supt Christine Kelk said: "We have arrested a 17-year-old youth on suspicion of murder but we have a lot more inquiries to do in order to establish his whereabouts prior to the incident in Euston Close.
"I already know of some members of the public who saw someone acting suspiciously in Bean Street.
"I am appealing to anyone else who saw anything suspicious in that area to contact us as a matter of urgency."
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