The two AN-26 planes have landed after their morning flight. At 1440 local time, they reported "suspicious items floating in the sea" at N083621 E1031330. An Mi-171 helicopter and surface ships have been directed there for a closer look, estimated to reach there at 1900 local (UTC+7).
[This is approx 105 NM in direction 348 degrees from MH370's last known position near waypoint IGARI, as reported by FR24. It's approx 41 NM SSW from the Tho Chu island. The observation is approx 70 NM due north from the oil slick and smoke reported yesterday].
Since these sightings are in Vietnamese FIR, the authorities are preparing for the additional responsibilities that follow if MH370 is found in that area.
Other planes including a Singaporean C150 (?) plane have also identified traces or slicks on the sea but "nothing special". Many fishing vessels are said to operate in the area.
Disclaimer: From a Google
translation.
EDIT: Corrections to the coordinates and the Singaporean info in post #736 further below.