Tuesday's incident appears to mark the third time this year that Palestinians inside Jerusalem have been involved in attacks on Israelis.
The Illinois senator addressed an enthusiastic crowd of some 250,000 that stretched for a mile to the storied Brandenburg Gate.
Media coverage favors Obama, his campaign says.
The Democratic presidential nominee, who delivers the sole public foreign policy speech of his overseas tour here Thursday, was dubbed 'president of the world' by Der Spiegel.
A Christian Science perspective on daily life.
The presidential candidate has said he will draw down troops in Iraq if elected.
Senator Obama is an unknown quantity as he tours the Middle East.