A newborn girl has been found abandoned in a holdall on a doorstep, police said.
A note written in Polish was left with the baby who was dumped opposite the Polish centre in London Road, Reading, Berkshire, yesterday evening.
The infant, believed to be between two and three weeks old, is being cared for by medical staff at the Royal Berkshire Hospital.
Officers from Thames Valley Police said early indications suggest she is unharmed.
They added that they are concerned for her mother, who may need medical help.
Police received a call at 8.59pm yesterday, and officers believe the baby may have been left on the doorstep about an hour and a half earlier.
Superintendent Stuart Greenfield, from Thames Valley Police, said: “Early indications are that the baby appears unharmed, with no immediate evidence of any injuries or trauma.
“Our main concern now is for the welfare of her mother, who may need medical assistance.
“We are keen to hear from anyone who saw anything at the time, or may have any information, no matter how small, which could assist in identifying who left the baby.
“We believe that she was left on the doorstep between 7.30pm and 9pm.
“Although we cannot say for certain that one or both of her parents are Polish, the fact that the note was written in Polish leads us to think that this may be the case.
“Therefore, we would be particularly keen to hear from anyone within the Polish community in Reading who may have any information relating to the baby or her mother.”
Anyone with information is asked to call Detective Inspector Mark Tucker at Thames Valley Police on 101, or Crimestoppers anonymously on 0800 555 111.
Meanwhile, police have revealed that the baby boy found dead in waste which was being sorted at a recycling plant was a newborn child.
The body was discovered by a member of staff at Bell Waste Control in Scunthorpe, North Lincolnshire, on Wednesday.
Humberside Police said a post-mortem examination confirmed the infant was a newborn boy.
The cause of his death is yet to be established and further tests will be carried out, police said.
The teenage mother of the baby contacted police in a distressed state on Wednesday and is receiving medical care at Scunthorpe General Hospital.
Police are continuing their inquiries into the circumstances of the baby’s death.
The body was found by a member of staff sorting cardboard, wood, paper, metal and other objects for recycling who was left traumatised by his ordeal.
He originally mistook the boy for a doll or toy, but on realising it was a child dropped it instantly.
A statement from Humberside Police said: “A post-mortem examination of the baby found at Bell Waste Control in Scunthorpe on Wednesday May 2 has confirmed that it was a newborn baby boy.
“However the cause of death is yet to be established as the results came back inconclusive and further tests will now be carried out.
“The teenage mother remains in hospital receiving medical care and police inquiries into the circumstances of what happened are continuing.”
There has been a happier outcome in Bedfordshire where a teenage mother who went missing with her new-born baby has been found.
Bedfordshire Police launched an appeal for help to find 16-year-old Jasmine Woodbridge and her son Jayden yesterday after she left Luton and Dunstable Hospital without telling anyone.
She gave birth at the hospital on April 30.
Today Bedfordshire Police thanked the public for their help and said the pair had been found safe and well. A spokesman said they had been returned to hospital.