The reason for his death is uncertain and speculations abound.

Little is known for sure about this mysterious lady, but speculation abounds.

Speculation still abounds as to why the Titanic met disaster.

Inevitably, the wait led to discussions about what happened at the club, and speculation abounded.

Speculation abounds over how all this will work out.

Speculation abounded as to the nature of his supposed misdeeds.

Grim speculation about possible military operations abounds at www.debka.com, an Israeli site.

When he withdrew from performing publicly in 1978, speculation abounded.

When a well-known literary figure misses a year, speculation abounds.

History didn't pinpoint him as his wife's killer, but legend and speculation certainly abounded.