The New Haven Register reports that at least 15 people were hospitalized with nausea, cramps and vomiting Wednesday after a catered lunch at the United Illuminating Co. on Church Street.

Four other people became ill but declined to go to the hospital, said city Fire Department EMS Supervisor Abe Colon. Inside the Connecticut Financial Center, city health department officials collected samples of the food, which included pulled pork and chicken, and shipped them off to a laboratory for testing to see whether food poisoning was to blame.

Until those results comes back, said city Director of Health William P. Quinn, it’s impossible to conclusively say what caused the people to get sick.

Tests could be completed as soon as today on the food and fecal samples collected at the hospitals, he said.