Viral WhatsApp Message
The images that have gone viral on WhatsApp groups claiming to be of a metro collapse in Chakala, Mumbai are fake. This incident did take place but about 5 years back on September 4, 2012, when a 50-feet long concrete slab collapsed at the Metro railway's under-construction airport station around 4.35pm on Tuesday. The accident killed one labourer and injuring 16 others, two of them critically.
No such fresh incident has been reported by Mumbai police or any of the news channels. These images can be linked to several stories on searching Google. Here are a few links for your reference.
1. Mumbai metro bridge collapses - India Today
3. 50-ft-long Mumbai metro slab slips, 1 killed, 16 hurt - Times of India