The principal threat to stability, he said, is "what's happening in the economy.

Even in peace, governments across Central America have said violence remains the principal threat to stability.

The principal threat comes from yellow crazy ants which were accidentally introduced to the island.

Some of the principal threats to these special ecosystems are:

The principal threat to New York populations is rock climbing.

"There are so many guys up there, there's about six principal threats."

Some of the principal threats to this species are land conversion and pipeline construction.

Yet the principal remaining threat to the peace process is not the heterogeneity of the administration.

The case has loomed as the principal legal threat confronting the tobacco industry.

The principal threat to all these species is predation by the introduced black rat.