A day after a massive fire in a Mumbai pub, Union minister Hardeep Singh Puri today said it was a wake-up call for Delhi and called for zero tolerance towards those flouting fire and safety norms in the national capital.<br/>'<br/><br/>The housing and urban affairs minister in a tweet said rampant construction and flouting of fire and safety norms was turning Delhi into tinderbox. Expressing anguished at the apathy, he said that heart goes out to bereaved families.