Karachi, May 20 (IANS): At least 13 people were killed and over 30 others injured when a passenger bus turned turtle in Pakistan's Sindh province on Thursday, local media reported.

The bus was on its way to Karachi, the provincial capital, from Multan city in Punjab, Xinhua news agency quoted Senior Superintendent of Police in Sukkur, Irfan Samo as saying to the media.

Investigation into the cause of the accident is underway, and some local media reports quoted sources as saying that the bus driver lost control over the over-speeding vehicle while negotiating a sharp turn.

The injured have been shifted to a hospital in Rohri area of the district and the medical superintendent of the hospital Pervaiz Akhtar told the media that six people died on the spot while others succumbed to injuries on the way to the hospital or in the hospital.

Akhtar added that six of the injured are in critical condition and the hospital is providing the best possible medical treatment to them.

Some of them will be shifted to other hospitals of the district.

Local reports said all of the killed and injured came from Multan and were on their way back to work in Karachi after spending the Eid al-Fitr holiday at home.

The government allowed inter-provincial public transport from Sunday, lifting a week-long ban on travelling between the provinces during Eid holidays amid the pandemic.