Do you think that "Abdul Hameed Reeki, chief spokesman of the Jundallah" is a Baluchi? Or is his group taking refuge there to conduct ops into Iran?
The Shias and the Sunnis in Pakistan have been at each other's throats for many years now. Though I don't know much about the Jundallah (translation: "army of allah"), I am willing to bet money that Reeki is a native Baluchi sunni. The Baluchis are known for their distrust of outsiders (even muslims from the rest of Pakistan) and it is highly unlikely that they are allowing his group to merely take refuge there.
To be honest, this news is not surprising at all. A few years ago, sunnis ransacked the office of the consul general of Iran and killed 12 Iranian staffers in public (I am not 100% sure about the number though). In fact, Friday prayers in Pakistan are usually marked by attacks on shia mosques by sunnis and vice versa.