Pakistan on Thursday put rescue agencies on high alert to evacuate people from riverside areas as the death toll from weeks of heavy monsoon rains crossed 150 and a global relief agency warned that millions more might be at risk. Thousands of rescuers and hundreds of boats were deployed in the central province of Punjab as rainwater flooded the River Indus that flows from the Himalayas to the Arabian Sea, said Farooq Ahmad, spokesman for the regional rescue agency. The north-western region of Khyber-Pakhtunkhwa was worse affected by flash floods, landslides and glacial lakes outburst incidents…