Two men have been arrested on suspicion of the murder of a 10-month-old baby boy in Hertfordshire.
A 51-year-old from St Albans and a 37-year-old from Hatfield are in custody.
Police and paramedics were called to The Runway in Hatfield on Sunday night, after reports a baby was not breathing. He later died at the Lister Hospital.
Hertfordshire Police said officers were carrying out a forensic investigation of a property in St Albans. The cause of the baby's death remains unknown.
A post-mortem examination is expected to take place later, police said.
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