More than 100 people have been sickened with suspected food poisoning after attending a national food safety summit earlier this month in Baltimore, NBC News reported.

The summit was held at the Baltimore Convention Center April 8-10 and attracted at least 1,300 of the country’s top food safety officials.

Maryland state health officials said they heard back from at least 400 attendees and are investigating to find out what caused participants to report symptoms such as diarrhea and nausea.

“We are working on evaluating possible exposures and doing testing at the Maryland state public health laboratory to attempt to identify an agent,” officials said in a letter to attendees.

The convention center and its food service provider, Centerplate, went through a routine investigation by city health officials, in which Centerplate was issued a violation notice for condensation dripping from an ice machine in the kitchen, a spokesman told NBC News.

“None of us are very happy when we hear these things,” said Peggy Daidakis, executive director of the center, in an earlier interview. “We’re not trying to hide anything. If there is something, we’ll take the corrective measures.”

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