Terror Attack in Jerusalem

Reports are coming in of a bus bombing in Jerusalem:

A bus was hit by a massive explosion outside the Jerusalem's central bus station on Wednesday, Israeli medical sources said, adding that many people had been injured.

First reports say 20 injured. More as it comes in.

UPDATE:  Now reported as 25 injured, 4 serious, no fatalities.  There hasn't been an attack like this for quite awhile.  I would expect a vigorous response from Prime Minister Netanyahu.

UPDATE:  This was not a suicide bomber, but an explosive device tied to something at a bus stop.

UPDATE:  Now reporting 1 fatality.