URGENT - Malaysia-Phillipines-Operation

Published: Mar 04 2013 07:47:40 PM EST

(CNN) -- Malaysian security forces launched an operation early Tuesday morning targeting "armed intruders" in Lahad Datu on the Malaysian island of Borneo, Malaysia's official Bernama news agency reports. The standoff began last month when more than 100 men from the mainly Muslim southern Philippines came ashore in the Malaysian state of Sabah on Borneo, demanding to be recognized as representatives of a sultanate that has historical claims on the area.