They presented a potential threat of disease, he said.
They concentrate in the thyroid and represent a potential threat of thyroid cancer, among other illnesses.
The potential threat of emerging chemicals to the aquatic flora is a major issue.
What has galvanized opinion in other parts of the world, however painful or unfair it may seem to Americans, is not just the potential threat of Iraq but also the potential threat of the United States.
Just before Obama was sworn in, the homeland security department said it was investigating a potential threat "of uncertain credibility".
The potential threat of secret hardware-based backdoors or kill switches has been discussed for several decades.
South Africa has faced its own questions over the potential threat of terrorism during the World Cup.
Not doing so would have restored New Orleans's more traditional urban geography, and likely reduced the potential threat of stormwater.
Even foot soldiers pose a potential threat of terrorism if released to a nation that cannot provide credible security assurances.
I think in Washington it is better understood - the potential threat of Russia putting challenges on different countries.
That same reluctance has been matched by our aversion to facing the potential threat of nuclear emergencies.
