India, June 23 -- The US Embassy in Qatar has advised American nationals in Qatar to remain indoors until further notice. The alert was sent via an email to American citizens.

The embassy statement further stated that the advice was made "out of an abundance of caution" and provided no more details.

The warning comes at a time when US alerted its citizens in major cities like New York of "heightened threat."

US President Donald Trump publicly discussed the possibility of changing the Iranian government on Sunday, even though top officials in his administration had previously stated that overthrowing the Islamic Republic was not an American agenda.

"It's not politically correct to use the term, "Regime Change," but if the current Irani...