A bomb blew apart a train traveling through Pakistan's eastern Punjab province Monday, killing 10 people and wounding 40 others, authorities said.

The blast came hours after a bomb exploded at a courthouse in neighboring Sindh province, wounding eight. There was no claim of responsibility for either attack; police said they had no suspects.The train was passing through the Punjab town of Pattoki, 40 miles south of the eastern province's capital, Lahore. Rescue workers had to use saws and blowtorches to free passengers.

Last month, there were four bombings in Pakistan - three in Punjab province and one in the southern port of Karachi - that left a total of 16 dead. Police and government officials blamed those bombings on Pakistan's hostile neighbor, India, a accusation New Delhi denied.

Pakistan and India, which have fought three wars since both gained independence from Britain 50 years ago, routinely blame each other for domestic violence.

Religious and ethnic violence has killed more than 500 people in the past year in Pakistan, with much of the violence in Punjab, the province's most populated.

The bomb in Sindh was planted outside a wooden cabin next to the courthouse where prisoners were detained.

Five policemen guarding prisoners were among the eight injured in the blast in Sukker.