Jordan: US forces plan shield against Syria

The two Western diplomats said the Britons, about a half-dozen officers specialized in intelligence gathering and special operations techniques, visited Jordan a few times over the past three months. The diplomats insisted on anonymity, saying that public comment may hamper their information gathering on Syria.

The Jordanian army already has an extensive presence on the border and has been assisting waves of Syrian refugees, who are straining the country's meager resources, mainly health care, water and utilities.

Jordan hosts some 200,000 Syrian refugees, more than any other neighboring country. Some come under constant firing from their army as they cross into the kingdom. Jordanian border guards have been wounded and a 6-year-old Syrian boy was killed in July.

Jordanian men also are moving the other way across the border, joining what intelligence officials have estimated to be about 2,000 foreigners fighting alongside Syrian rebels trying to topple Assad.

Associated Press writer Dale Gavlak in Amman, Jordan, contributed to this report.