(CNN) -- The Royal Canadian Mounted Police said authorities Friday took a fourth person into custody in their ongoing investigation into domestic terrorism. 

The RCMP said its Integrated National Security Enforcement Team executed a search warrant in Ottawa and took one person into custody. No charges have been filed. 

Earlier Friday, a Canadian government source close to the investigation said the three men arrested previously "are not card-carrying members of al Qaeda but they follow in the movement and show common trends." 

RCMP Chief Superintendent Serge Therriault said Thursday the three suspects are Canadian citizens living in Ontario -- Hiva Mohammad Alizadeh, 30, of Ottawa; Misbahuddin Ahmed, 26, of Ottawa; and Khurram Syed Sher, 28, of London. 

The name of the suspect arrested Friday has not been released. 

Alizadeh faces three charges: conspiracy, committing an act for a terrorist group and providing or making available property for terrorist purposes. Canadian federal prosecutor David McKercher told CNN the three charges carry maximum sentences ranging from ten years to life in prison. 

Ahmed has been charged with conspiracy, but he could face more charges, according to his defense attorney. Ian Carter told CNN he met with Ahmed for half an hour. Asked how the suspect was feeling, Carter said, "He is in shock." Ahmed is married and has a 7-month-old daughter. 

Sher also is charged with conspiracy, officials said. 

The RCMP said the three suspects were arrested under Canada's Anti-Terrorism Act, passed in 2001. 

Therriault said that a yearlong investigation found that in addition to forming part of a terror cell, the suspects possessed schematics, videos, drawings, instructions, books and electrical components designed specifically for the construction of improvised explosive devices. He said authorities seized more than 50 circuit boards designed to remotely detonate IEDs. 
Where is he from?
Hiva Mohammad Alizadeh, 30, of Ottawa