'We received enough indications over the past few days that he could have gone through with it,' a senior spokesman said.
American experts on China say they have received independent indications of the change in policy.
The company said it had received indications of interest in an acquisition deal but no specific offers.
Her son, she said, had apparently received indications that he was about to go on a perilous assignment.
Beginning in April 1944 the squadron received indications that it would not remain a training organization much longer.
Last month, the company announced that it had received "indications of interest" from an unidentified company.
But he said, "We have received indications from five students that they will be declining our offer because of last week."
"We are beginning to receive indications that our propaganda is having some effect."
He said he had received indications that a deal can be struck.
"As such, we've received indications that some of our key personnel have been observed and identified for possible targeting."