From The TimeSplitters Wiki

Bricking it
Game	TS2
Section	Glass Smash
Map	Siberia
Character	Lt. Frost
Enemies Encountered	None
Rewards	Brick
Medal Requirements	Bronze: 1 min 0.0 sec Silver: 0 min 30.0 sec Gold: 0 min 18.0 sec Platinum: 0 min 11.0 sec

Briefing

After Private Poorly's incident with a grenade yesterday, all ammunition has been confiscated until further notice. This is no excuse to miss training though, so you'll have to improvise!

Strategy

Go the same directions as Pane in the Neck except smash each window with the bricks and go inside the building up top. The last building needs precision throwing from the window through the door but that should get you the statues and prizes.