A strong jobs report on Friday overcame concerns raised by the bombings in London and pushed the stock market up in a shortened week of trading. Most of the gains came on Friday, the day after the attacks, when a four-year-low unemployment rate of 5 percent was announced. Coupled with healthy June retail sales reports, the markets finished the week with a roar. The Dow Jones industrial average was up 146 points for the day and 1.5 percent for the week, to reach 10,449.14. The Nasdaq’s increase was 3 percent, to 2,112.88, over four days of trading. The short week of trading saw little movement among the three advertising-agency holding companies. IPG was up just less than a percentage point to $12.27, while Omnicom closed up a nickel over four days at $80.50. WPP, trading as American Depository Receipts on the Nasdaq, finished down 2 percent, at $50.89.