Crews are at the scene of a sewer overflow in Lake Union on Monday afternoon.
The Seattle Public Utilities said the overflow is at the southeast corner of the lake.
The overflow has been stopped and part of the lake will remain closed to water activities until water samples show the water is safe.
Officials said the overflow was likely caused by a grease plug, which blocked the sewage from flowing to the pump station.
Crews have placed "No Water Contact" signs.
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