Crews have stopped a water line leak yesterday that threatened a U.S. Postal Service building in Mt. Lebanon, and service was restored later for those affected.

The break in the line was reported just after 5 a.m. in the vicinity of a rupture last summer, police said.

Crews shut off the supply, and Castle Shannon Boulevard has been closed between Scott Road and Anawanda Avenue, said Gary Lobaugh, spokesman for Pennsylvania-American Water Co., which serves the municipality.

About 15 customers, including the post office and a nearby tavern, have been without service since the start of the incident.

Repair workers who plugged the leak also will assess nearby sections of the 12-inch service line to stave off future problems, Mr. Lobaugh said.

The incident has caused traffic detours, but no injuries have been reported.

Service was restored around 7:20 p.m., the company said.

Looking for more from the Post-Gazette? Join PG+, our members-only web site. You'll get exclusive sports content, opinion, financial information, discounts from retailers and restaurants, and more. Our introduction to PG+ gives you all the details.