(REUTERS) 

Alphabet's Google has advised some employees on US visas to avoid international travel due to delays at embassies, ​Business Insider reported on Friday, citing an internal email.

The ‌email, sent by the company's outside ​counsel, BAL Immigration Law, on Thursday, ⁠warned ‌staff who need a visa stamp to re-enter the United States not to leave the country because visa processing times have lengthened, ⁠the report said.

Google did not immediately respond ⁠to a Reuters request for comment.

Some US embassies and consulates face visa appointment delays of up ​to 12 months, the memo said, warning that international travel will "risk an extended stay outside the US", according to the report.

The administration of President Donald Trump this ​month announced increased vetting of ‍applicants for H-1B visas for highly skilled workers, including screening social media accounts.

The H-1B visa programme, widely used by the US ‍technology sector to hire skilled workers ⁠from India and China, ​has been under the spotlight after the Trump administration imposed a $100,000 ​fee for new applications this year.

In September, ‍Google's parent company Alphabet had strongly advised its employees to avoid international travel and urged H-1B visa holders to remain in the US, according to an email seen by Reuters.