Four Arab nations cut diplomatic ties to Qatar early Monday morning, and Bahrain has given citizens 14 days to leave the country.
The decision further deepens a rift between Gulf Arab nations over Qatar's support for Islamist groups.
Bahrain, Egypt, Saudi Arabia and the United Arab Emirates all announced they would withdraw their diplomatic staff from Qatar, a gas-rich nation that will host the 2022 FIFA World Cup.
Saudi Arabia said the move was made for the "protection of national security" and Qatari troops would be pulled from its ongoing war in Yemen.
Bahrain blamed Qatar's "media incitement, support for armed terrorist activities and funding linked to Iranian groups to carry out sabotage and spreading chaos in Bahrain" for its decision.