Christian lobby questions 'car fire' case

The Australian Christian Lobby has taken issue with the police handling of an explosion outside its Canberra offices late last year.

A 36-year-old man from the Canberra suburb of Deakin will appear in the ACT Magistrates Court on June 7 charged with arson and property damage.

Police allege a van stocked with gas cylinders ignited in the car park of the ACL building on December 21, blowing out windows and destroying furniture.

ACL managing director Lyle Shelton says while the latest development is a welcome step, he's concerned the result has taken five months to achieve.

"I am also concerned that the police continue to refer to the incident, which blew out thick glass windows on the ground floor and first floor of our office, as a 'car fire'," Mr Shelton said in a statement.

The AFP had made a number of "seemingly contradictory" statements about the incident.

"Why did this incident occur at the ACL office? Why not some other venue? How exactly were the AFP able to conclusively rule out particular motives so quickly?" Mr Shelton said.