Several groups, including the Islamist militant Pakistani Taliban (TTP) and separatist groups from Balochistan have carried out attacks in recent months.
Imran Khan had been sentenced to 10 years for leaking state secrets and 14 years along with his wife for illegally selling state gifts.
The US State Department recently expressed its concerns over the restrictions on freedom of expression in Pakistan.
The 14-year imprisonment is harsher than the 10-year sentence given to Khan on Tuesday on charges of revealing state secrets, and comes as Pakistan prepares for an election on Feb. 8.
Imran Khan, a legendary cricketer turned Prime Minister, faced charges for allegedly retaining and communicating a classified diplomatic cable or cipher
The jail term is the second conviction for Khan in recent months, and ensures the popular politician will remain out of the public spotlight ahead of next week's parliamentary vote.
No individuals or groups had claimed responsibility for the shootings in the restless Sistan-Baluchestan province, Iranian state media said.
Pakistan International Airlines flight attendants have been failing to report back after landing in Toronto, and while some blame low salaries and fear of privatization, the airline blames Canada.
Pakistan's allegations come months after both Canada and the United States separately accused Indian agents of being linked to assassination attempts on their soil.
The tit-for-tat strikes are the highest-profile cross-border intrusions in recent years, raising alarms for the rest of the Middle East.
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