Police: Man allegedly assaulted MTA employee at BX subway

Police are searching for a man they say attacked an MTA employee at a Bronx subway station on Thursday. 
They tell News 12 the man approached the 54-year-old worker while he was cleaning the inside of a 5-train at the Eastchester-Dyre Avenue station.
News 12 is told the suspect then started punching the victim in the face.
Police have identified the suspect as 22-year-old David Willis.
The victim was taken to Montefiore Hospital North where he was treated for cuts to the head.