HIROSHIMA, Japan — Pope Francis is praying for the victims of Japan’s flooding and is encouraging civil authorities involved in search and rescue operations.

Francis sent a note of condolences to Catholic church authorities on Monday, saying he was “deeply saddened” to learn of the loss of life. At least 100 people are believed to have died, and another 80 people are unaccounted for, after heavy rains and mudslides thrashed southern Japan.

In the message, Francis expressed his solidarity with all those affected, offered his encouragement to rescue crews and said he was praying for the dead and injured “and the consolation of all those who grieve.”

Some residents in Hiroshima prefecture said they were caught off guard in a region not used to torrents of rainfall, which began Friday and worsened through the weekend. Rivers overflowed, turning towns into lakes, leaving dozens of people stranded on rooftops. Military paddle boats and helicopters were bringing people to dry land.

The assessment of casualties has been difficult because of the widespread area affected. Authorities warned that landslides could strike even after rain subsides as the calamity shaped up to be potentially the worst in decades.

Japan’s government said Prime Minister Shinzo Abe has canceled his planned July 11-18 trip to Europe and the Middle East to oversee the emergency response.

Chief Cabinet Secretary Yoshihide Suga said Abe was scheduled to visit Belgium, France, South Arabia and Egypt, beginning Wednesday. Abe was expected to sign a free trade pact with EU while in Europe.