ISLAMABAD, Nov. 7 (Xinhua) -- Two teachers and two students sustained serious injuries when militants hurled a hand grenade into a girls school in southwest Pakistan's Balochistan province on Saturday, according to local TV channel reports.

    Police sources said that unidentified militants hurled a hand grenade into the girls school located near Mannu Jan Road in Quetta, the capital city of Balochistan, which exploded in the school premises, injuring two teachers and two students seriously.

    The wounded were rushed to nearby hospital. Quetta police have registered a case against unknown militants and started investigation into the explosion.

    It is worth mentioning that incidents of target killings and attacks on teachers had created a panic and harassment amongst teachers and students of educational institutions in the provincial capital. Unidentified men shot and killed a University of Balochistan professor outside his residence in the provincial capital late on Thursday.

    Analysts said that as in the past the motive behind the attacks was ethnic. Educationists from non-Baloch ethnic groups have been assassinated in target killings in Balochistan in the past few months. Educationists from non-Baloch ethnic groups have been assassinated in target killings in Balochistan in the past few months. Baloch militants have threatened them not to play the national anthem or fly the national flag at educational institutions.

Special Report: Pakistani Situation