The Gülenist Terrorist Group (FETÖ) is likely to try new methods to infiltrate state organizations, Turkey's National Intelligence Agency (MIT) said in a report Sunday.

In the report presented to the Parliamentary Committee investigating the July 15 coup attempt, the MIT warned that the terror group seemed likely to infiltrate strategic institutions and to begin implementing new methods to countermeasures taken by the security officials against the group.

The intelligence agency also advised public institutions to follow the merit system principle when recruiting and selecting new personnel.

The report said that FETÖ's first plot to overthrow the Turkish government was in February, 2012 when the security officials linked to FETÖ attempted to interrogate MIT chief Hakan Fidan.

MIT said the controversial raid on trucks belonging to the agency, which paved the way for FETÖ to spread its propaganda accusing Turkey of secretly supplying weapons to Syria, was also a step that laid the groundwork for the coup attempt.

The FETÖ terror organization is accused of masterminding the July 15 coup attempt last year that killed 248 people and injured hundreds.

The terrorist group, which has posed as a religious charity for decades, moved to seize power in multiple coup attempts in 2013 and last year.

A string of investigations revealed that Gülenists have been involved in a wide array of crimes, from money laundering to orchestrating sham trials to imprisoning critics and conspiring against anyone opposing the clout of FETÖ in Turkey.

Since then, thousands of suspects in the police, military, judiciary and public sector have been dismissed, suspended, detained or arrested for their links to the terrorist group.

Critics of FETÖ say the group was bent on infiltrating MIT and to achieve this, they sought the suspension of intelligence service administrators by implicating them in different cases.