WASHINGTON — Unification Church founder the Rev. Sun Myung Moon is being treated in an intensive-care unit at a hospital in Seoul for pneumonia.

The Rev. Joshua Cotter, vice president of the Unification Church USA, says Moon entered the hospital on Aug. 13 and is in critical condition. He says church members are praying and fasting for his quick recovery.

A memo sent to church officials early Wednesday says the 93-year-old Moon "was pushing his limits in carrying out his schedule" when he fell ill. It says his wife and children are by his bedside.

Moon founded the Unification Church in Seoul in 1954. The church gained fame starting in the 1970s for holding mass weddings.

Its business empire includes The Washington Times newspaper and the New Yorker Hotel in Manhattan.

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  • Religious leader and founder of the Unification Church Reverend Sun Myung Moon delivers his address, 15 February 2002 at the opening session an international peace conference organized by his church in Seoul. Moon will conduct a mass wedding ceremony on February 16 during which 3,500 couples will get married, as part of the five-day peace gathering. (Photo credit: EMMANUEL DUNAND/AFP/Getty Images)

  • SUWON, SOUTH KOREA - JULY 22: Reverend Moon Sun Myung, founder of the Unification Church, gives a gold medal to Robert Tesche of Hamburger during the ceremony after the Peace Cup final match between Hamburger SV and Seongnam Ilhwa Chunma at Suwon World Cup Stadium on July 22, 2012 in Suwon, South Korea. (Photo by Kiyoshi Ota/Getty Images)

  • SUWON, SOUTH KOREA - JULY 19: Reverend Moon Sun Myung, founder of the Unification Church, speaks during the opening ceremony prior to the Peace Cup match between Seongnam Ilhwa Chunma and Sunderland at Suwon World Cup Stadium on July 19, 2012 in Suwon, South Korea. (Photo by Kiyoshi Ota/Getty Images)

  • SEOUL, SOUTH KOREA: South Korean Reverend Sun Myung Moon leader of the Unification Church, cuts a huge cake in his 80th birthday celebration at Seoul's Lotte Hotel 10 February 2000. Indonesian President Abdurrahman Wahid and other foreign VIPs led 16,000 people in celebrations. (Photo credit: CHOO YOUN-KONG/AFP/Getty Images)

  • SEOUL, SOUTH KOREA: South Korea's Reverend Sun Myung Moon (L), leader of the Unification Church, greets Indonesian President Abdurrahman Wahid (R) with a hand shake in celebration of Moon's 80th birthday at Seoul's Lotte Hotel, 10 February 2000. Wahid and other foreign VIPs led 16,000 people in celebrations marking the 80th birthday of Moon. (Photo credit: CHOO YOUN-KONG/AFP/Getty Images)

  • Rev. Sun Myung Moon meeting with U.S. President Richard Nixon at the White House.

  • SEOUL, SOUTH KOREA - FEBRUARY 13: Sun Myung Moon (2nd L), founder of the Unification Church, and his wife (2nd R) bless the brides and the grooms in a mass wedding ceremony at Chamsil Olympic Stadium in Seoul 13 February 2000. Unification Church founder Moon married some 60,000 of his believers, many renewing their vows. AFP PHOTO (Photo credit: PARK MEE-HYANG/AFP/Getty Images)

  • CHEONAN, REPUBLIC OF KOREA: Some 3,600 couples attend a Unification Church ceremony at a gymnasium in Cheonan, 80 Kilometers south of Seoul, 01 August 2005. The ceremony is part of what the church called the International Blessing of 400 million couples to wrap up a week-long World Culture and Sports Festival sponsored by the church. (Photo credit: JUNG YEON-JE/AFP/Getty Images)