known so far about the brothers suspected in the deadly attack. suarez: we examine how investigators are trying to figure out whether the brothers acted alone or were part of a larger terrorist organization. brown: and we look at how technology allowed police and the public to work together in identifying the suspects. suarez: plus, we get the perspective of mark shields and david brooks on terror s return to u.s. soil and the rest of the week s news. brown: that s all ahead on tonight s newshour. major funding for the pbs newshour has been provided by: support also comes from carnegie corporation of new york, a foundation created to do what andrew carnegie called real and permanent good. celebrating 100 years of philanthropy at carnegie.org. and with the ongoing support of these institutions and foundations. and. and friends of the newshour. this program was made possible by the rporation for puic badcasting. and by contributions to your pbs station from
suarez: plus, we get the perspective of mark shields and david brooks on terror s return to u.s. soil and the rest of the week s news. nighrown: that s all ahead on s newshour. major funding for the pbs newshour has been provided by: support also comes from carnegie corporation of new york, a foundation created to do what andrew carnegie called real and permanent good. celebrating 100 years of philanthropy at carnegie.org. and with the ongoing support of these institutions and foundations. and. and friends of the newshour. this program was made possible by the corporation for public broadcasting. and by contributions to your pbs station from viewers like you. thank you. brown: it s been an extraordinary scene and it continues, as boston spent the day locked down by a manhunt for the second brother authorities believe was involved in this week s marathon bombing. that s come after a violent confrontation overnight that left the other bombing suspect and a polic