Yep...I'm thinking it's some sort of local issue. Of course some people (commie MSM) would love for it to be a global "religion" problem. All religions are evil and cause strife and war...don't you know.
I’d suspect a political/economic component. Christianity, because it stresses the individual, it is often seen as a threat to established structures that stress either the state or a group.
Christians, in particular Catholics, have often been attacked in Hindu areas of India because they were perceived as violating the economic status quo simply by ignoring the caste system (which, while technically forbidden by the Indian Constitution, remains very much alive, especially in rural areas).
I would suspect that there is some kind of nationalist/political/economic motivation behind this Buddhist attack. It may be that the outlook of Buddhism combines well with Communism (the Marxist guerrilla movement is very active there), but less well with Christianity, and at some point they came into conflict.