Several areas in Mumbai were waterlogged on Saturday after heavy rains lashed the city with the onset of monsoon, The Indian Express reported.

Till 6.03 pm, the city’s Colaba locality had received 49 mm of rain while Santa Cruz recorded 26 mm of rain, private weather agency SkyMet Weather said.

A portion of the Mumbra Bypass collapsed on a building near Uday Nagar, ANI reported. No casualties or injuries were reported. In central Mumbai’s Prabhadevi, four people were injured in the morning when the slab of a building situated on Veer Savarkar Marg collapsed.

The Chhatrapati Shivaji International Airport issued a statement, saying no flights had been diverted or cancelled, The Indian Express reported. Earlier in the day, two flights were diverted while trains on the Central Railway line were running 20 minutes late.

The weather department has predicted heavy rainfall in many places across the city till June 11. It also predicted “heavy to very heavy” rain over Goa and Konkan region between June 7 and June 12. According to the weather department, rainfall of 15.6 mm to 64.4 mm is considered moderate, 64.5 mm to 115.5 mm is heavy, 115.6 mm to 204.4 mm is very heavy and more than 204.5 mm is extreme.

“We have declared monsoon onset over the state at 11.30 am on Friday,” Ajay Kumar of the India Meteorological Department told the Hindustan Times. “The onset line covers parts of south Konkan, south-central Maharashtra and isolated areas of Marathwada and southern Vidarbha.”

Mumbai received rainfall since Friday evening. Till 8.30 am on Saturday, Jogeshwari Vikhroli Link road received the most rainfall (138 mm) while Worli got the least (22 mm).

Pre-monsoon showers on Thursday led to severe waterlogging in some areas of the city and delayed train and flight services. The Brihanmumbai Municipal Corporation said three teams of the National Disaster Response Force, equipped with flood rescue material, will be stationed at Parel and Mankhurd for the eastern suburbs, and Andheri Sports Complex for western suburbs. Navy personnel will be deployed in Colaba, Worli, Ghatkopar, Trombay and Malad for flood rescue, and six Flood Rescue Teams of the Mumbai Fire Brigade will be posted at the Regional Command Centres.