Peter Westerstrøm (1779–1809) was a Swedish mass murderer who gained notoriety for the Saksebøl Slaughter in Moss, Norway during the Napoleonic wars.
An unconfirmed rumour stated that he had fled Sweden after having murdered and robbed his late employer, Lieutenant General Liljehorn.
In Norway, he established himself as a tailor in the city of Moss, traveling around the local countryside to obtain work from the surrounding peasantry.
The victims were the station manager Johannes Jensen and his three servants Lars Arvesen, Jens Svensen and Karen Olsdatter.
The case was open and shut: He was found in possession of much of the stolen goods and could lead the authorities to where he had hidden the rest.
His third confession stated that the murder was done out of revenge, as he believed the station manager had been instrumental in breaking up his engagement to a rich heiress.
On 24 July 1809, he was sentenced by the commission to be pinched five times with red-hot pincers by the executioner; after this his hand would be lopped off with an axe and finally he would be beheaded.