Pakistani authorities say a suicide bombing killed at least eight soldiers inside a paramilitary post in the capital, Islamabad.
Officials say the bomber detonated his explosives after sneaking in the barracks after dark Saturday. The paramilitary post is located in a wooded area near a main road. At least four soldiers were wounded.
Earlier in the day, authorities say a suicide bomber struck a military checkpoint in Pakistan's North Waziristan region, killing least three people near the town of Miran Shah.
Elsewhere in the tribal region, security officials say a suspected U.S. missile strike on Saturday killed at least 13 people, including foreign militants.
The strike targeted a home in the region, which is a known hotbed for Taliban and al-Qaida militants.
And police say at least 46 migrants were found dead inside a crammed shipping container in the southwestern province of Baluchistan, near the country's border with Afghanistan.
Authorities in the city of Quetta say the container entered Pakistan from Afghanistan and was bound for Iran. Officials say about 100 people were in the container, most were Afghans. Several surviving migrants were hospitalized.
U.S. officials say western Pakistan's lawless tribal regions have become a safe haven for al-Qaida and Taliban militants responsible for attacks in Pakistan, as well as Afghanistan.
Unmanned U.S. aircraft have carried out at least 35 missile strikes on militant targets in northwest Pakistan over the past year.
The United States never confirms the strikes. Pakistan says the missile attacks are counterproductive and a violation of its sovereignty.
Pakistani President Asif Ali Zardari on Saturday pledged to protect the country from rising fundamentalism. Mr. Zardari spoke at the grave of his father-in-law and former Pakistani Prime Minister Zulfikar Ali Bhutto to mark the 30th anniversary of the former leader's death.
President Zardari told a crowd in Sindh province that he will not allow Pakistan to disintegrate and be taken over by extremists.
Some information for this report was provided by AP and Reuters.