police open fire onto his room vs police open fire on his room

Some examples from the web:

• Open fire when stabilizer syncro is complete.
• Riesling, request permission to open fire.
• Finding alternatives to cooking over open fires indoors.
• Holding onto his favorite stuffed animal...
• Substantial blood loss onto his chest before falling forward.
• Suspects may open fire on audience to create diversion.
• We demand the unconditional surrender of this space station or we will open fire.
• Drop out of warp or we will open fire.
• Reduce power immediately or we will open fire.
• They are ready to open fire on the mob.
• There's half a universe up there already, waiting to open fire.
• General, in exactly two minutes... the fleet will open fire.
• If you do not capitulate immediately, we will open fire.
• Unless we turn over the Commander they'll open fire on the station.
• There was no reason for them to open fire.
• Spell's got to be cast over an open fire.
• Person or persons unknown open fire right on the dance floor.
• Barbecues, open fires, foreign food... and traveling.
• Batteries one, three and four open fire and continue at will.
• Send him out or we open fire.

Some examples from the web:

• Suspects may open fire on audience to create diversion.
• They are ready to open fire on the mob.
• Unless we turn over the Commander they'll open fire on the station.
• I will open fire on the next thing that moves.
• 2.6 billion people cook on open fires - on coal, wood and animal dung.
• Open fire on the Republic ship.
• Unless you intend to take him by force, in which case I'll open fire on your ship.
• And now, the left wing is mad at me because, in August, I ordered my men to open fire on the General.
• Heads up, the Lucian Alliance is getting ready to open fire on us.
• He thinks somebody has his men and unless they're produced, he'll open fire on the town.
• Well, I need this to happen, so I'll be here unless Marty opens fire on us.
• At a given signal, they will open fire on your troops... driving them forward into the trap.
• We will move in close and open fire on the area.
• He wants to set up a heavy machine gun in a ditch And open fire on the retreating Germans.
• So, we got three male blacks in ski masks walk in at lunch rush, open fire on the table, and leave through the kitchen.
• I repeat, any man who opens fire on Jack Napier will answer to me.
• And if they open fire on the civilian fleet while we're boarding?
• I personally feel the worst damage has been done by a minister in your government who can speak of the need to open fire on convoys of immigrants at sea.
• What the hell is that, open fire on tactical?
• Guy opens fire on a hospital staff, then he's in the wind again?