However, businesses with operations and employees in Yemen and Saudi Arabia are already taking precautions and are aware of the risks, said Murison. Recent events have not changed the terrorism-risk profile dramatically. Her advice to those in these areas now is to be more aware of varying travel routes to avoid tracking and to stay away from large-gathering places known as hotspots for activity. Civil unrest and demonstrations may actually hold more risks for safety than possible terrorist activity, she said.

, vice president, consulting & investigations, with security and risk mitigation company Andrews International, agrees that a fast-gathering and angry crowd would be the larger concern for foreigners in volatile cities now.

"These group demonstrations can manifest themselves very quickly and without warning," he said. "We would advise people to keep a close eye on the streets, have their situational awareness attuned because these crowds can become violent very quickly and become dangerous for people who might find themselves in the midst of these things."

Besse, who has a client with operations in Pakistan, is not advising business travelers to stay grounded in the wake of the recent State Department advisory.

"I'm not necessarily telling people to hold off on essential business travel right now. I think it's still possible for them to do that. They will probably see some slow down at the airport and increased security will probably cause some delays, but we see no reason for canceling travel plans."