The US embassy in Kyiv was shut down on Wednesday morning after receiving information of a potential significant air attack, US officials said. "Out of an abundance of caution, the embassy will be closed, and embassy employees are being instructed to shelter in place," the US Department of State Consular Affairs said in a statement published on the website of the US embassy in Kyiv. "The US embassy recommends US citizens be prepared to immediately shelter in the event an air alert is announced,"