A sales representative at the Apple store who answered the phone said: "We are closed due to an unforeseen event. Unfortunately, there is a water-line break, so the police have shut down Walnut Street."
Laura Copeland, a spokeswoman for the Philadelphia Water Department, said a city crew shut down the main about 9:30 p.m., leaving 20 to 25 residential and commercial customers without water.
She said the crew would work through the night to repair the main and restore service.
Roads were closed between Locust and Chancellor on 16th Street, and on Walnut Street between 15th and 17th Streets, Copeland said.
A Starbucks employee at 16th and Walnut said the store was closed and would not reopen until morning.
"We are just waiting to hear back from police and the water company. Everything is blocked off; no one can walk in." Water continued to flow in the streets at 6:30 p.m. "We are technically still open, but just no customers," the worker said.
"We're closing up, cleaning up," said James Reynolds, general manager of Qdoba Mexican Grill at 1528 Walnut, shortly before 7 p.m. "We're open, but you can't get to us. The water has been shut off, but we have some in the pipes."
At the swank Le Bec-Fin restaurant, Shannon Corin, private events coordinator, said: "We've had some guests who have had difficulty getting to us, but we are open and serving dinner. We have a wedding reception going on right now in our private dining room, and some very happy diners throughout the restaurant."
She said police were letting people through. "The sidewalks are still open." Le Bec-Fin still had water. "We are able to wash our dishes."
Contact Linda Loyd
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Inquirer staff writer Peter Dobrin contributed to this article.