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Judges in the United States Supreme Court have been debating tough legal and scientific questions on whether human genes should continue to be patented. Their decision which's expected in the summer could have enormous implications for research. The nine justices are looking at the right of one company Myriad Genetics to hold the patent on a genetic test for breast and ovarian cancer. Opponents say these patents prevent research by other companies and denied patients' access to the test which cost more than $3000.

BBC News

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[00:01.16]BBC News with Jonathan Izard.

[00:04.14]Police say at least two people have been killed and 23 injured in two powerful explosions right by the finishing line of the Boston Marathon.

[00:11.95]The blasts took place within seconds with each other as hundreds of runners were ending the race in the US city cheered on by a large crowd.

[00:18.02]Paul Adams reports from Washington.

[00:20.17]The explosions occurred within seconds of each other close to the finish line on Boylston’s street in the center of Boston.

[00:26.54]Four hours into the race there were still plenty runners on the street, and the crowds were dense.

[00:31.46]Television picture showed smoke billowing up from among the flags lining the route.