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Witness Joe Curry, with Catholic Relief Services, has seen his share of typhoons in the past.
"This one was incredibly intense and big," said Curry, who was on the Philippines' Bohol Island when Typhoon Haiyan struck. The island was recently hit by an earthquake, so several aid agencies and the government have concentrated efforts there.
"The strength of this typhoon is phenomenal, and the way it moved across the Philippines is something of serious concern," said Curry.
Aid agencies will likely be pulled out to other parts of the region, with "serious shelter needs," said Curry.
"Housing can be very fragile and especially in rural areas that were hit today by the typhoon. So we can expect likely tens of thousands of houses destroyed and damaged," said Curry.