Police officers in Boston were conducting a major sweep in Boston to find the second suspect in the deadly Boston Marathon bombings after his brother was killed by security forces overnight as he tried to escape. Tamerlan Tsarnaev, a 26-year-old was killed overnight and his 19-year-old younger brother, Dzhokhar Tsarnaev was still on the loose. Officers were searching Watertown area under a lockdown which Boston police said could continue for a couple of days as business owners were asked to keep their shops closed. Also police raided twice overnight house of a Turkish resident in Watertown living . \"My house was raided twice last night. At around 1 in the morning, armed people entered into my house from the roof and I was scared because I didn\'t know they were police officers. And a couple of hours later police came and searched my house again,\" Arzu Eylul Yalcinkaya told the Anadolu Agency.   In a related development, Turkish interior minister has denied news reports appearing on American media that suspects travelled to the US from Turkey. Muammer Guler said Tamerlan Tsarnaev holding a Kyrgyz passport and three other people with the same surname arrived in Istanbul, Turkey, on July 9, 2003 and they left ten days later on July 19, 2003, adding that Dzhokhar Tsarnaev, the second suspect still at large, was not among the four visiting the country. \"It appears that they were visiting as a family. There is no indication that they have got anything to do with Turkey,\" Guler told reporters.