At least eight people were killed and 20 others were injured as a blast hit a shrine in Pakpattan, a city in Pakistan's Punjab province, early Monday morning, local media reported.

According to the report, the blast took place at about 06:34 a. m. local time when a motorcycle planted bomb exploded at the eastern gate of the shrine of Baba Farid in the city which is located in the eastern part of Punjab.

Many people were inside the shrine praying while the blast took place, said the report, adding that two unknown man run away after they parked a milk supply motorcycle carrying milk cans containing explosives inside.

Police have cordoned off the area and rescue workers have rushed the injured people to nearby hospital. Hospital sources said that at least ten people were critically injured and the death toll could further rise.

No group has claimed the responsibility for the blast yet.

Monday's blast is the third major attack on a shrine in Pakistan over the past four months or so. The first attack of its nature took place at the Datta Darbar Shrine in Lahore on July 1, which left about 40 people killed and over 170 others injured. The second occurred at the Abdullah Shah Ghazi Shrine in Karachi, killing 14 people and injuring more than 70 others.