Columbia University says it's strengthening its procedures after it accidentally sent acceptance notices to 277 prospective students and then recalled them. Columbia says the emails, sent Wednesday, "incorrectly implied" that the applicants had been accepted into its School of Public Health 's Master's program.

Columbia University says it's strengthening its procedures after it accidentally sent acceptance notices to 277 prospective students and then recalled them. Columbia says the emails, sent Wednesday, "incorrectly implied" that the applicants had been accepted into its School of Public Health's Master's program.