Passage: Flooding in India has been primarily confined to the northern portion of the country, including Assam, West Bengal, Bihar,Rajasthan and Uttar Pradesh. In the latter two, over 500 and over a hundred have died (respectively). By mid-August, flooding had affected over 31 million people, and damaged or destroyed over 800,000 houses. Over 85% of Kaziranga National Park was flooded. Government officials were criticized for not placing more preventative measures before these floods hit. In Bihar, for example, Reuters reported that there was anger at the number of embankments and roads which were designed with few to no provisions for water drainage. In Gujarat state, the floods and rains were reported to have caused 224 deaths in June and July months.Mumbai faces severe problems each year during the monsoon season because of its loose building restrictions and large homeless population, but this year's season saw the city receive more rainfall and worse flooding than the Maharashtra floods of 2005. One hospital was flooded, and the city's public transportation was forced to shut down. The weather also caused a century-old multi-story building to collapse, killing at least 33. On 29 August 2017, Mumbai was again witness to floods due to a confluence of torrential rains and high tide, resulting in 298 mm of rainfall in a period of 9 hours. 5 people are reported to have lost their lives in Mumbai due to the deluge which saw the highest rainfall in a single day in August since 1997.For the third consecutive year, monsoon season has been marked by flooding in the northwest and northeast regions, while drought in India worsens along the southern peninsula. According to an Indo-Asian News Service release issued in September, these "rainfall extremes have increased threefold over the last few years and now extend over all of central India -- from Gujarat to Odisha."

Question: How many people died when an old building collapsed in Mumbai due to a flood?
33