DUBAI - The health of the Kuwait's 91-year old emir has shown "significant improvement", parliament quoted the prime minister as saying in a tweet on Tuesday.

"There is a significant improvement, thank God," Prime Minister Sheikh Sabah Al-Khalid Al-Sabah was quoted as saying.

Emir Sheikh Sabah al-Ahmad al-Sabah is in the United States completing medical treatment following surgery for an unspecified condition in Kuwait.

(Reporting by Maher Chmaytelli and Maha El Dahan; Editing by Alison Williams) ((Maha.Dahan@thomsonreuters.com; + 9712 4082101; Reuters Messaging: maha.dahan.thomsonreuters.com@reuters.net))