Chipotle founder and co-CEO Steve Ells says he is "deeply sorry" about the customers who were sickened after eating at the chain in recent weeks.
"They're having a tough time and I feel terrible about that," Ells said in an interview on NBC's Today show. He repeated the company's pledge to tighten food-safety procedures to ensure such incidents do not happen again.
Boston College, meanwhile, raised the number of students who have reported feeling ill after a group of them ate at Chipotle, to 141, from 120. The school said 12 of them did not eat at the restaurant.