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The Mexican restaurant La Hacienda on Park Street is closed while public health officials investigate a potential foodborne outbreak that has sickened about 25 people, according to a public health official.

The 23-year-old Madison restaurant at 515 S. Park St. has been closed since Thursday night as investigators gather information, said Doug Voegeli, environmental health director for Public Health Madison and Dane County.

Voegeli said the number of people affected was “approximately 25.” Because the investigation is ongoing, the department couldn’t give an exact number yet, he said.

The investigation was expected to wrap up Monday, but the report will take a few more days, he said. La Hacienda owner David Herrera didn’t respond to voice or text messages Monday.

Voegeli was unable to say what caused the outbreak, nor could he identify the type of illness that occurred. “We don’t know. We need to get more information,” he said.

In terms of the condition of those sickened, or whether anyone was hospitalized, Voegeli said he is unable to give out health information.

He also couldn’t say when the restaurant would reopen. “We’re working with (Herrera) right now,” Voegeli said.