Officials said security forces have been alerted about the reports and that soldiers were told to stay on alert. "We are still verifying that reports. We have alerted our troops in the southern Philippines," said First Lt. Steffani Cacho, a regional military spokeswoman.

Malaysian authorities said that Chen Yui Chung, 48, and Lai Wong Chung, 46, were seized by five masked gunmen on Monday from the island of Sebangkat, off the town of Semporma, and were believed spirited to Tawi-Tawi or Sulu province, where Abu Sayyaf militants are actively operating.