Police attending two rock-throwing attacks on buses in Sydney's southwest have themselves been set upon.
Bus drivers at Rosemeadow reported the two incidents to police - rocks thrown at their vehicles in separate attacks late yesterday.
Officers then received reports of a brawl on Macbeth Way involving up to 30 people but when they arrived they found the crowd calm and left.
Around 10 o'clock the situation escalated - the group turning on police.
Officers had a number of projectiles thrown at them but weren't injured.
The riot squad was placed on standby and extra police brought in.
The situation has calmed overnight - police say they're now focusing on who threw the objects at them and the bus drivers.