The event on March 31, was to help reveal a new, lower-priced phone that may be named either iPhone 9 or iPhone SE2.
The debut was called off in part to reduce risk of spreading the coronavirus, according to tech blog Cult of Mac.
The blog said that it wasn't clear yet if the event will be rescheduled.
Santa Clara County, where Apple is headquartered, recently banned events involving 1,000 or more people for the remainder of the month.
Apple didn’t respond to the Post for comment Wednesday.
Apple has warned retail employees about shortages, which would be an indication of the coronavirus having an impact on the company’s supply chain, according to Bloomberg.
The postponement also arrives as the viral epidemic has wreaked havoc on Apple's Chinese production lines.
Apple suppliers Foxconn and Dialog Semi have commented that the China-based supply chain should be mostly back in action by the end of this month.