Washington, Jumada II 7, 1434, Apr 17, 2013, SPA - U.S. Homeland Security Secretary Janet Napolitano said Tuesday there was no indication that the bomb explosions in Boston, which killed three people and wounded more than 170, were part of a broader plot. Napolitano said in Washington that "out of an abundance of caution," the Department of Homeland Security (DHS) and other authorities would keep in place "enhanced security measures at transportation hubs." Napolitano urged the public to remain vigilant and to immediately report any signs of suspicious activity to local law-enforcement officials. --SPA 11:18 LOCAL TIME 08:18 GMT www.spa.gov.sa/1099755