New York City Mayor Bill de Blasio urged that there be a pause in demonstrations until after the funerals of two slain police officers.
The Boston bombing suspect's defense team filed a motion to remove demonstrations from the courthouse.
The Justice Department will review the case now that local officials have declined to press charges.
Google's self-driving car, which lacks a steering wheel, will be tested on public roads in 2015, the company said.
Rank-and-file officers, some of minority background, are aligning against the NYC mayor after two cops were shot dead in Brooklyn.
The S&P 500 broke its record closing high for the 50th time this year as the Dow closed in on a new psychologically important milestone.
The security threat came just hours after Pakistani officials issued arrest warrants for militant leaders.