Wellington, New Zealand Residents in cyclone-ravaged Vanuatu hunkered in emergency shelters for a second straight night Saturday after venturing out to find their homes damaged or blown away by the powerful storm, aid workers said.

Packing winds of 270 kilometers (168 miles) per hour, Cyclone Pam tore through the tiny South Pacific archipelago early Saturday, leaving a trail of destruction and unconfirmed reports of dozens of deaths.

Power remained out across Vanuatu later Saturday and people on many of the outer islands had no access to running water or outside communications, said Chloe Morrison, a World Vision emergency communications officer in the capital, Port Vila.

Morrison said communications have been so problematic that her aid group hasn't yet been able to account for many of its own 76 staff on the islands and authorities have been unable to assess the extent of the damage.

"I can say that for anybody who wasn't in a secure shelter last night, it would have been a very, very tough time for them," she said.

Vanuatu has a population of 267,000 spread over 65 islands. About 47,000 people live in the capital.

Morrison said authorities did a good job Friday moving thousands of people in Port Vila into 23 evacuation centers. With the winds and rain easing Saturday, many people stepped out only to find that their homes were missing a roof or had disappeared, and were forced to return to the shelters.

Teetering trees and downed power lines in Port Vila have made many areas hazardous, Morrison said, adding that she had heard reports of entire villages being destroyed in more remote areas.

"It's still really quite dangerous outside. Most people are still hunkering down," she said.

U.N. Secretary General Ban Ki-moon said the impact and scope of the disaster caused by the cyclone wasn't yet clear, but he feared the damage and destruction could be widespread.

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Cyclone Pam leaves trail of destruction on South Pacific island nation