for one's part字典解释是: 对某人来说, 就个人来说
e.g. for my part, totally agree with you. 至于我,我完全同意你的看法.
而在这里,要联系上下文来理解.
前面谈到:The United States condemned
the attack and said ...接下来是:the Pakistani President Asif Zardari said .
前面谈美方,后面谈巴方,因此,在这个语境下,for his part的意思是,对巴方而言.
而就语法层面上讲,for his part算做插入语,跟下面这些句子用法类似,可作参考:
To be frank,I don’t like it (To be frank是插入语) 坦白的说 ,我并不喜欢
In my opinion,she did very well (In my opinion是插入语)在我看来,她做的很好