And the announcement a month later of a non-aggression treaty between Germany and the Soviet Union gave Tokyo even more cause for concern.

VOA: special.2011.05.26

But he says it is cause for concern because it is a new strain, and people have not built up an immunity to it.

VOA: standard.2009.05.01

Prime Minister Abhisit Vejjajiva, who is traveling to the United States this week, told reporters prior to his departure the doctors had assured him the king's health was not a cause for concern.

VOA: standard.2009.09.21

"For all those whose cares have been our concern, the work goes on, the cause endures, the hope still lives and the dream shall never die."

VOA: special.2009.09.13