The incident happened around 3am.
Gardaí n the midlands are appealing for witnesses to a serious assault in Longford in the early hours of this morning.
A man in his late teens suffered serious head injuries in Ballymahon at about 3.20am, and was taken to Mullingar Hospital for treatment.
The investigation team are keen to speak to anyone who was around Main Street between 2 and 4 this morning.
Gardaí are particularly interested in hearing from passers by who may have camera footage from the street during that time period.
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