India, Sept. 20 -- The United States State Department issued a major security warning over rising tensions in the Middle East on Saturday. The State Department has urged Americans in the region to remain vigilant and advised those outside the region to reconsider travel plans.

The warning came as President Donald Trump reportedly cut short his trip to Camp David.

A report by Axios's Barak Ravid sparked concerns about the early return coinciding with reports of Iran's issuance of "Code 100." It is the highest level of preparedness alert for its armed forces. It has, however, not been confirmed by any Iranian news agencies.

The State Department said the security environment in the Middle East remains "complex" with the possibility of "un...