His young child's illness has prompted speculation that he may have been distraught.
Chemical's move prompted speculation that still other big banks would follow suit.
Their decision has prompted speculation about its larger political meaning.
This prompted widespread speculation in the media that its days as a political force were numbered.
The disappearance of the lights should have prompted much discussion and speculation.
The boy's European appearance long prompted speculation about his paternity.
This prompted speculation that he had offered to resign, which was denied.
The mayor had no public appearances in the city all weekend, prompting speculation that he could have been out of town.
The sales prompted speculation that China's need for wheat might be larger than previously thought.
The current crisis here has prompted speculation about the intentions of the armed forces.