The killing of four policemen last week in Karachi has set off alarm bells in the Counter Terrorism Department (CTD) of the Sindh police after the attack was claimed by a relatively unknown splinter group of militants returning from Syria.
Though target killing of policemen and security personnel is not new in Karachi, Pakistan's biggest city, but creditable leads and information with the CTD confirm that the new outfit - Ansar-ul-Sharia Pakistan - carried out the deadly attack.
"The information we have indicates that since April this outfit has carried out three attacks. A retired army officer, Colonel Tahir Nagi was targeted near Baluch Colony while two policemen were gunned down in New Town area in May. And the latest attack has come in which four policemen were killed while having Iftaar at a hotel last week," one source said.
"We are concerned because these returning militants from Syria are battle-hardened and well-trained and they could launch major terrorist attacks in parts of the country," another source said.
He said the militants had fought in Syria under the banner of Jabhat al-Nusra which is loyal to al-Qaeda leader Ayman al-Zawahiri rather than ISIS chief Abu Bakr al Baghdadi.
"The group announced its formation on social media and since than the leads we have show these are battle hardened militants whose primary targets appear to be policemen and retired security officials," he added.
"Some of the people who have returned from Syria after fighting there also appear to be educated and well positioned persons," he added.
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