SAN JOSE (CBS/AP) — Authorities say an ammonia leak at a San Jose water treatment facility has been contained, allowing police to lift a stay-in-place order issued to nearby residents.

Police say hazardous materials crews arrived at the Santa Teresa Water Treatment Plant Saturday morning after receiving reports of a strong odor emanating from inside. They discovered a leak in a 5,000-gallon holding tank containing aqueous ammonia.

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Santa Clara Valley Water District spokesman Tony Mercado tells the San Jose Mercury News that police advised 25 residents near the plant to stay indoors.

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Police estimate about 250 gallons leaked from the tank before the spill was contained at 2:15 p.m.

Mercado says the plant’s water supply was not contaminated by the spill. He says the cause of the leak is still under investigation.

No injuries were reported.

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