Two Filipino fishermen were reported missing in Scarborough Shoal, or locally known as Bajo de Masinloc, the Philippine Coast Guard (PCG) said Thursday.
The PCG said it received a report on Wednesday that Mori Sierra and Lloyd Akot failed to return to their homes in Palauig, Zambales after five days of fishing in the shoal.
Authorities have deployed the BRP Tubbataha and an Islander plane to search for the two, it said.
The PCG has also coordinated with the Chinese Coast Guard to help in the search operations.
A notice has likewise been issued to all those passing through the area to render assistance to the fishermen if they are sighted.