KARACHI: Authorities in Pakistan’s Sindh province have imposed an emergency in Karachi, the country’s largest city and commercial capital, after flash floods triggered by heavy rain inundated vast swathes of the metropolis, killing at least seven people in separate incidents. The downpour on Tuesday brought life to a standstill as several thoroughfares in the city of over 20 million were deluged by floodwaters. Rainwater entered homes in low-lying areas of the city, triggering power outages.