The Shanghai Cooperation Organization's 23rd meeting emphasized the need for improved regional economic collaboration to enhance prosperity among member states
Siddiqui rose to notoriety after her conviction in 2010 on multiple charges, including attempting to kill American officials.
The incident occurred in district Bannu, which borders the restive North Waziristan tribal region on the Pakistan-Afghanistan border.
Muhammad Shahzeb Khan, 20, was arrested in Canada earlier this month as he allegedly tried to enter the US.
Pakistani police detained several lawmakers from Imran Khan's party after a major rally demanding his release led to clashes.
Wilders, whose party joined government for the first time this year after a clear election victory, has lived under tight security for the past 20 years due to death threats.
The largest of the attacks targeted vehicles from buses to goods trucks on a major highway, killing at least 23 people, officials said, with 35 vehicles set ablaze.
Sindh Chief Minister Murad Ali Shah ordered an immediate investigation, including recommendations for addressing the problem.
Hafeez lives in the US with his wife, also a pro-Israel activist, and serves as director of Christians United for Israel (CUFI), a pro-Israel Christian organization with some 10 million members.
Iran and Pakistan have previously had a tense relationship, but reports have shown improvements since Iran's April presidential visit.