-- [Breaking news update at 11:05 p.m. ET]
Ocean Shield has been able to reacquire the signals that are consistent with airplane locator beacons on two more occasions -- both on Tuesday, said Angus Houston, head of the Australian-led search effort on Wednesday.
Ocean Shield has now detected four transmissions in the same broad area.
"I believe we are searching in the right area," he said.
[Last update posted at 9:56 p.m. ET ]
Flight 370: Careful not to project 'false hope' as days go by since last pulses