Business was brisk Thursday night at the Mighty Taco location on Military Road — despite reports that several local health agencies were investigating the regional restaurant chain.

Officials with the Niagara County Department of Health announced Thursday afternoon that they are looking into reports of illness possibly associated with Mighty Taco restaurants. 

The investigation is being conducted jointly with the New York State Department of Health, Erie County Department of Health and the New York State Department of Agriculture and Markets. 

Russell Jasulevich, Mighty Taco’s CEO, said on the company’s website that five customers from four store locations recently reported illness concerns after eating at the restaurant chain.

The complaints came from customers at four different locations in Erie County.

They ate at the restaurants sometime between Saturday and Tuesday, according to the New York State Department of Health.

“The focus has now turned to the New York State Department of Health testing an isolated batch of refried beans provided by a third-party supplier for any possible cause,” Jasulevich wrote. “There are no conclusive results at this time but, in an abundance of caution, Mighty Taco has voluntarily removed that sole suspect batch of refried beans from our stores and that batch is no longer available to customers.

For the past few days, added Jasulevich, the restaurant chain has been working “both internally and with the Erie County Health Department to investigate illness concerns expressed by a small number of customers.”