In a statement, the militant group warned that "what is coming is more bitter and harder."
A new CBS News/New York Times poll shows a majority of blacks and whites agree that race relations are bad.
The agreement is expected to enhance trade between the two nations to $70 billion a year by 2020.
For many years, climate-change experts have proposed limiting global temperatures to 2 degrees Celsius above pre-industrial levels.
Chancellor Angela Merkel defended the cooperation extended by Germany to the NSA, saying it was necessary to combat terrorism.
Pacquiao, who will undergo surgery this week for a shoulder injury, denied claims he did not disclose it before the fight against Mayweather.
A new report has blamed the Israeli army's "policy of indiscriminate fire" for the deaths of Palestinian civilians in last year's war in Gaza.
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