Under current definitions, which I believe have been heavily shaped to define the current threat, no, it is not terrorism.

A quick google takes one to ABOUT with several definitions. In 1937 it was terrorism according to the League of Nations:

"All criminal acts directed against a State and intended or calculated to create a state of terror in the minds of particular persons or a group of persons or the general public."

And it may meet the current FBI definition:

"The unlawful use of force or violence against persons or property to intimidate or coerce a Government, the civilian population, or any segment thereof, in furtherance of political or social objectives."

And certainly it is under the Arab Conventions of 1998; which ironically have about the lowest standard for what qualifies as terrorism. The cynic in me would say it is because it really flies in the face of Arab culture to have to work too hard at anything...:

"Any act or threat of violence, whatever its motives or purposes, that occurs in the advancement of an individual or collective criminal agenda and seeking to sow panic among people, causing fear by harming them, or placing their lives, liberty or security in danger, or seeking to cause damage to the environment or to public or private installations or property or to occupying or seizing them, or seeking to jeopardize a national resources."