Guess what's causing a lot of the fires?

LOS ANGELES (AP) - November 24, 2010

Los Angeles County deputies report finding 1,700 pot plants growing in a home.

The grow house was discovered after a compost pile in the living room caught fire.

Detective David Mertens tells the Pasadena Star-News that a man was seen running from the home.

But no arrests have been made.

Mertens says often gangs rent out houses to use as indoor pot farms.

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