Pakistan's financial capital Karachi hit by torrential rain and flooding

(Corrects typo in headline)

KARACHI, Pakistan (Reuters) -Pakistan declared a public holiday in Karachi as the financial capital braced for more rain on Wednesday, after the arrival of the annual monsoon season left at least seven people dead and caused widespread flooding, officials said.

The monsoon has brought havoc across Pakistan in recent days with the death toll from flash floods that struck the mountainous northwest on Friday rising to 377.

In Karachi, at least seven people have died since the rains began in the southern port city on Tuesday, said Abdul Wahid Halepoto, a provincial government spokesperson. Rainfall reached levels not seen in years in some parts of the city, Pakistan's largest, with a population of more than 20 million.

Deaths were caused by drowning, road accidents, building collapse and electrocution, Halepoto said.

Authorities ordered educational institutions and offices to shut.

"We are expecting more intense rains," said Anjum Nazir, a spokesperson for the provincial meteorological department.

Tuesday's rain was recorded between 80 mm (3.15 inches) and 178 mm (7.01 inches) in different parts of the city, he said.

Nazir said the area around the airport received 163.5 mm of rain, the highest recorded there since 1979. Some 178 mm of rain was recorded in the northeast of the city, the highest since the weather station there was set up five years ago.

The rain also disrupted power, mobile phone services and flights, officials said. Local television footage showed cars and other vehicles floating down streets, with houses submerged in water.

Karachi Electric said the sudden downpour had caused some disruption to its distribution network. Restoration efforts faced significant challenges due to waterlogging, access and overall traffic congestion in the city, its spokesperson said.

He said KE teams would be able to restore the majority of electricity feeders within eight to 12 hours.

Rescue workers, police, volunteers and government agencies were helping relief efforts, the city's Mayor Murtaza Wahab told a press conference.

"We are using all our resources to clear roads and restore utilities," he said.

Wahab said the rain had overwhelmed the city's infrastructure, adding that the city's drainage system has the capacity to handle 40 mm rain, and that anything above that would spill over into flooding.

There have also been heavy monsoon rains in Mumbai, India's financial capital, with some parts of the city drenched with as much as 875.1 mm of rain in the five days leading up to August 20, the local weather department said.

Many schools in the city were closed for a second straight day on Wednesday, while train services were disrupted.

    Authorities requested residents avoid venturing out as more rain was predicted.

(Reporting by Ariba Shahid and Asif Shahzad in Islamabad and Shilpa Jamkhandikar in Mumbai; Writing by Asif Shahzad; Editing by Kate Mayberry and Alex Richardson)