A man was injured and rocks were thrown during a party in Waikiki last night

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.