While 11 persons have been rescued from the debris, many others are feared trapped and the toll is likely to rise, police said.
Four of a family were among those killed in the cloudburst that damaged six houses, two shops and a school.
"Flash floods triggered by cloudburst hit Thathri town at 2.20 am resulting in a massive increase in the level of the 'nullah' flowing along the Jamai Masjid locality close to the town" a police officer said.
"As of now, six persons including five women have died and their bodies recovered from the debris. 11 people have been injured and rescued from the debris. They have been shifted to hospital", a police spokesman said.
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Dev Raj of Nagni village lost his 40-year-old wife Naru Devi, daughters - 14-year-old Sapna Devi and 7-year-old Priya Devi and 9-year-old son Rahul. Their bodies have been recovered, police said.
The injured have been admitted to the Primary Health Centre (PHC) at Thathri, the spokesman said.
"However, several others are still under the debris and more casualties cannot be ruled out," the Dy SP said.
"We cannot assess the exact loss of life or property immediately as we are in the middle of rescue operations trying to save those still trapped under the debris," Ahmed said.
"The entire district administration, along with the police and army, has started rescue operation on a war footing," the police official said.
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