QUETTA, Pakistan (AP) — A powerful earthquake collapsed at least one coal mine and dozens of mud houses in southwest Pakistan early Thursday, killing at least 23 people as the death toll continued to creep higher. At least four people were killed when the coal mine in which they were working collapsed, said Shaheen, citing coal miners in the area. At least nine critically injured people were taken to the provincial hospital in Quetta. The worst earthquake, in 1935, destroyed the provincial capital of Baluchistan and killed more than 35,000 people. Pakistan is a nation of 220 million people, 60 percent of whom live in the country’s eastern Punjab province.