Saudi Arabian Airlines (Saudia) has suspended all flights to Qatar, it said on its official Twitter account on Monday, without providing further details.

A Saudi-led Arab coalition fighting Yemeni rebels announced Monday it was ending Qatar's membership as most Gulf countries severed ties with Doha amid heightened tension between the neighboring states, AFP reports.

Credit rating agency Moody's Investors Service is concerned that the rift between Qatar and other regional states could have an impact on Qatar's credit outlook, if trade and capital flows are disrupted, a senior Moody's analyst told Reuters on Monday.

Egypt on Monday announced it was cutting diplomatic ties with Qatar, accusing Doha of supporting "terrorism", as Saudi Arabia, Bahrain and the United Arab Emirates adopted similar measures.

The United Arab Emirates cut ties with Qatar on Monday, state news agency WAM reported, accusing its Gulf Arab neighbor of supporting extremism and undermining regional stability.

Qatar said on Monday it was facing a campaign of lies and fabrications aimed at putting the Gulf Arab state under guardianship, after Saudi Arabia, the United Arab Emirates, Bahrain and Egypt cut ties with it.

Saudi Arabia, Egypt, the United Arab Emirates and Bahrain severed their ties with Qatar on Monday, accusing it of supporting terrorism.

Bahrain said on Monday it cut diplomatic relations with Qatar, accusing its fellow Gulf Arab state of backing terrorism and interfering in Bahrain's internal affairs.