Arbid and two other Hamas members were killed when the car exploded.
Retail politics, even by Hamas members, is familiar the world over.
Two Hamas members were also arrested, the group said.
Their arrests led to the detention of 40 more suspected Hamas members, the army said.
There is nothing in it except the views and perceptions of Hamas members who attended this conference.
Several other Hamas members were seized a day earlier.
Three other Hamas members were arrested at the site.
There have been a few public instances of Hamas members making decisions based on religion.
Hamas members say their influence is already powerful and widespread.
All of its seats were won by Hamas members in the 2006 parliamentary elections.