Police are appealing for witnesses following two assaults near Promenade Park, Maldon.
A young man has been left with what police described as "significant injuries" to his mouth requiring specialist treatment.
He was attacked at about 5pm yesterday, after a group of youths left the park via the High Street exit and turned into Park Drive.
A second young man was attacked in the skate park in Promenade Park at about 7pm.
Anyone with information is asked to contact PC Doug Furn at Maldon Police Station on 101 or email firstname.lastname@example.org