India, Dec. 21 -- After Google, Apple has issued an internal warning advising some of its employees on work visas not to travel outside the United States, as prolonged delays at US embassies and consulates risk leaving workers stranded abroad.

According to a Business Insider report, outside immigration counsels representing both Apple and Google sent emails cautioning visa-dependent employees against international travel if they require a visa stamp to re-enter the US.

The advisories come amid mounting backlogs in routine visa appointments following the rollout of enhanced social media screening by US authorities.

A memo sent on Thursday by BAL Immigration Law, which represents Google, warned that some US embassies and consulates are f...