TOFINO, British Columbia — Passengers were crowded on the left side of the top deck of a whale-watching boat when it was struck by a wave from the right side, causing the vessel to capsize and sending 27 people into the water off Vancouver Island, an investigator said.

Five British nationals were killed, and the search continued for a missing Australian man. Twenty-one people were rescued after the Leviathan II capsized Sunday afternoon.

Marc Andre Poisson, director of marine investigations for Canada's Transportation Safety Board, on Tuesday released preliminary results of the investigation into the accident.

Poisson said that with most passengers on the left side of the boat, “this would have raised the center of gravity, affecting the vessel's stability.”

When the wave approached from the right side, “we know that the vessel broached and then capsized.”

The investigation is expected to take months.

SHANGLA, Pakistan — Afghanistan and Pakistan were scrambling today to rush aid to survivors of this week's magnitude-7.5 earthquake as the region's overall death toll from the temblor rose to 385.Pakistan's disaster management authority said the nation's dead now were at 267, with 220 people killed in the northwestern Khyber Pakhtunkhwa province and another 47 elsewhere in the country.Afghanistan has reported 115 dead and 556 injured, while three people died on the Indian side of the disputed region of Kashmir. The head of the Afghanistan National Disaster Management Authority told parliament that 7,630 homes had been destroyed and around 1,000 animals killed.The quake, which struck Monday, was centered in Afghanistan's sparsely populated Badakhshan province bordering Pakistan, Tajikistan and China.The poverty-stricken region is vast, with mountains and valleys that make it difficult to reach.