Police in Pakistan’s port city of Karachi said Monday they were hunting a network of women from well-off families acting as fundraisers for the ISIL group, highlighting its growing appeal among the country’s middle classes.

Police in Pakistan's port city of Karachi said Monday they were hunting a network of women from well-off families acting as fundraisers for the ISIL group, highlighting its growing appeal among the country's middle classes.

Raja Umar Khattab, chief of the Counter Terrorism Department of Sindh province, said the hunt was launched after police arrested the suspected financier of a gun attack on a bus that left 44 people dead in May.

The attack on the bus was the first inside Pakistan officially claimed by ISIL, which has proclaimed a "caliphate" over territory it has seized in Iraq and Syria and is seeking to expand its global reach.

Khattab said the suspect, whom he named as Adil Masood Butt and who was arrested last week, confessed to police that his wife had established a religious organization in the city called 'Al Zikra Academy'.

"The academy has no organizational structure or offices," Khattab told AFP.

"A group of 20 women, all from well-off families, distributed USBs (computer memory sticks) containing ISIL videos, and also preached in support of terror organizations. They also arranged marriages among the group's followers," he added.

He said the group collected funds for terrorists in the name of "Islamic" charity which were later handed over to the accused.

"The wife and mother-in-law of the main suspect of the carnage, Saad Aziz, were also part of the network," he added.

Aziz, a graduate of one of the country's top business schools, was blamed by police for both the massacre and the shooting of peace activist Sabeen Mahmud in April. He was arrested in May.

Khattab said efforts were being made to track and arrest the women.

For over a decade Pakistan has been waging a war against homegrown extremist fighters that has claimed the lives of tens of thousands of civilians.

The fighting has been led mainly by Al-Qaeda, the Pakistani Taliban and its affiliates, though there are signs that the appeal of ISIL is growing among the affluent and educated classes who are motivated more by the idea of global jihad than local causes.

Islamabad denies ISIL is a major threat, though the police chief of Sindh province, of which Karachi is the capital, told a parliamentary standing committee in October that ISIL was behind the bus attack and that 14 people had been arrested for alleged links to the group.