Iron Hill Brewery & Restaurant abruptly closed its remaining locations Thursday, weeks after announcing the closure of three restaurants in the Philadelphia region .

No immediate reasoning was offered by the restaurant for the closure.

"It has been our pleasure to serve you, and we are deeply grateful for your support, friendship, and loyalty over the years," Iron Hill wrote on social media . "We sincerely hope to return in the future, and when we do, we promise to welcome you with open arms."

A sign announcing the closure is hanging on the door of the Iron Hill brewpub on Market Street in Philadelphia.

CBS News Philadelphia

Earlier this month, Iron Hill announced the closure of three locations, including its flagship brewpub in Newark, Delaware, which opened in 1996, as part of

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