A law enforcement bomb technician walks away after preparing the controlled detonation of a suspicious object during a search for a suspect in the Boston Marathon bombing, in Watertown, Massachusetts.
Lower house president Laura Boldrini (R) checks the t-shirt of PDL (People of Freedom party) member Alessandra Mussolini (C) during the second day of the presidential election in the lower house of the parliament in Rome, Italy.
A man places a bunch of flowers at the Monument to the Ghetto Heroes after a ceremony commemorating the 70th anniversary of the Warsaw Ghetto Uprising in Warsaw, Poland.
Astronomers have used NASA's Hubble Space Telescope to photograph the iconic Horsehead Nebula in a new, infrared light to mark the 23rd anniversary of the famous observatory's launch aboard the space shuttle Discovery on Apr. 24, 1990. (NASA/ESA/Hubble Heritage Team)