KATY, Texas - Traffic is building up on the Katy Freeway due to a crash that's blocking multiple lanes.

Katy Freeway traffic: Crash near Mason Road

What we know:

The crash was reported in the westbound lanes of Interstate 10 near Mason Road , close to Highway 99.

Harris County Lieutenant Terry Garza says the accident involved multiple vehicles, including a heavy truck. Emergency services were called to the scene.

Only one westbound lane was open as of about 4:50 p.m.

Drivers are advised to avoid the area.

What we don't know:

No other details are available at this time.

The Source: Harris County Lieutenant Terry Garza. Traffic Katy Harris County

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