The LAPD has gone into a heightened state of alert - like everyone else. And now they're offering some handy tips on what to do in case of an attack:

If you are in a building or structure, particularly a high-rise building, that is a target of terrorist activity, consider the following:

During the initial attack, you should seek cover under desks or tables. If these items are not readily available, move against an interior wall and protect your head with your arms. Move away from windows and balconies....

...If you are outdoors near the targeted location during the initial attack, duck behind an item that will provide you cover, such as a tree or doorway, and get down as low as possible.

Consider the possibility of additional attacks or secondary explosions.

Want more? The Rand Organization has put out a lengthy report on what to do in the event of chemical, bio or nuclear attacks.

Sleep tight.