Turkish security forces detained 40 suspects in separate operations targeting the Daesh terrorist group in Istanbul and the western province of Izmir, authorities said Tuesday.

In Istanbul, prosecutors launched an investigation into suspected financing networks linked to Daesh as part of efforts to disrupt the terrorist group's financial resources.

The Istanbul Chief Public Prosecutor's Office issued detention warrants for 15 suspects allegedly involved in financial transactions linked to Serdar Soylu, who had previously been investigated on accusations of providing funds to Daesh members killed in conflict zones and collecting money for the terrorist group.

Soylu was also accused of raising funds purportedly for Muslims held in camps in Syria, including al-Hol camp, according to prosecutors.

Security forces carried out simultaneous raids at 20 addresses, including 17 in Istanbul and others in the provinces of Kocaeli, Adana and Adıyaman.