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Officials: Floods that killed 457 in Pakistan and India endanger thousands more

  • Flood-affected people row boats past partially submerged buildings in floodwaters in Srinagar, India, Tuesday, Sept. 9, 2014. The death toll from floods in Pakistan and India reached 400 on Tuesday and have put more than half a million people in peril and rendered thousands homeless in the two neighboring states. (AP Photo/Dar Yasin)

    Flood-affected people row boats past partially submerged buildings in floodwaters in Srinagar, India, Tuesday, Sept. 9, 2014. The death toll from floods in Pakistan and India reached 400 on Tuesday and have put more than half a million people in peril and rendered thousands homeless in the two neighboring states. (AP Photo/Dar Yasin)  (The Associated Press)

  • An aerial view shows buildings submerged in floodwaters in Srinagar, in Indian Kashmir, Tuesday, Sept. 9, 2014. The death toll from floods in Pakistan and India reached 400 on Tuesday and have put more than half a million people in peril and rendered thousands homeless in the two neighboring states. (AP Photo/Dar Yasin)

    An aerial view shows buildings submerged in floodwaters in Srinagar, in Indian Kashmir, Tuesday, Sept. 9, 2014. The death toll from floods in Pakistan and India reached 400 on Tuesday and have put more than half a million people in peril and rendered thousands homeless in the two neighboring states. (AP Photo/Dar Yasin)  (The Associated Press)

  • Indian soldiers carry a rescued flood victim at the Air Force Station in Srinagar, in Indian Kashmir, Tuesday, Sept. 9, 2014. The death toll from floods in Pakistan and India reached 400 on Tuesday and have put more than half a million people in peril and rendered thousands homeless in the two neighboring states. (AP Photo/Altaf Qadri)

    Indian soldiers carry a rescued flood victim at the Air Force Station in Srinagar, in Indian Kashmir, Tuesday, Sept. 9, 2014. The death toll from floods in Pakistan and India reached 400 on Tuesday and have put more than half a million people in peril and rendered thousands homeless in the two neighboring states. (AP Photo/Altaf Qadri)  (The Associated Press)

Pakistani authorities say hundreds of thousands of people are fleeing flash floods after having been warned to evacuate as the death toll from severe monsoon rains in Pakistan and neighboring India climbs to 457 people.

Ahmad Kamal, spokesman for the National Disaster Management Authority, says the Chenab River breached an embankment early Wednesday following a warning the day before.

The floods, which began in the Himalayan region between the two countries on Sept. 3, have flowed down to the plains, affecting more than 1.5 million people in Pakistan. The deluge is the worst since 2010, when some 1,700 people died in flooding in Pakistan.