A militant allegedly linked to the Islamic State terror group has been arrested in Pakistan's southern port city of Karachi.

Abdul Aziz was allegedly involved in collecting funds and recruiting youth for ISIS (Islamic State) to be sent to Syria, according to a senior official of the Counter Terrorism Department (CTD).

Police arrested Aziz yesterday from the Orangi Town area in the city.

The CTD has launched a crackdown on ISIS-linked militants and facilitators in Karachi since late last year.

Earlier this week, the CTD claimed that it had busted a cell of the Islamic State terror group operating in Sialkot, arrested eight suspects and seized weapons, explosives and laptops, as well as a large number of compact discs containing publicity material.

Investigators claimed that the suspects wanted to overthrow democracy and introduce Caliphate in Pakistan through armed struggle.