The Drug Enforcement Administration said Monday that a tip led to the seizure of around 670,000 fake pills headed to Denver from Albuquerque.

More than 600,000 pills were seized earlier this month and a Denver man was arrested in Colorado Springs, according to the Drug Enforcement Administration (DEA).

Investigators warn about a rise in illegal, typically foreign-based online stores that are allegedly targeting Americans with deceptive practices.

“These companies operate illegally, deliberately deceiving American customers into believing they are purchasing safe, regulated medications when they are actually selling fake, counterfeit pills made ...