Robbers with a firearm burst into a post office and threatened staff.
Three men wearing balaclavas went into the post office on Liverpool Road North in Burscough at around 5.30pm today.
At least one of the men was armed and they stole an unknown amount of money.
They left in a silver Honda Civic which was later found burned out nearby.
Police are investigating the robbery and anyone with information is asked to call them on 101.