According to Police, in two letters – written in Sindhi language, received by the schools in Sachal Goth of Karachi, the miscreants have threatened to conduct suicide attacks in morning or evening shifts of the schools.
The letters were sent through postal service, police added.
After the letters Police and Rangers conducted raids in different areas of the city and arrested ten suspects.
Earlier on Tuesday morning (February 3), terrorists hurled a cracker near two private schools located in Gulshan-e-Iqbal, Karachi.
Fortunately, no casualties took place as the schools were closed during the time of the blast.