A ROCK was thrown through the window of a house, narrowly missing a baby, after a party got out of hand in Waikiki on Saturday night .
Rockingham Police are investigating assault and damage offences following the party in Mends Way.
Several calls were made to police after uninvited guests began smashing bottles in the backyard of a house and began spilling out on to the street shortly before midnight.
A brick was thrown through the window of a house, narrowly missing a baby.
A man who confronted the brick thrower was knocked unconscious.
Regional Operations Unit and Mounted Police came from as far away as Perth central business district to quell and disperse trouble-makers.