"Two Palestinian suspects are being questioned about the murder. Police said the pair fled to Jordan after the killing, but were extradited back to Dubai on Sunday."
"He says that although none of the Dubai 11 are in custody, there are the two Palestinians and more evidence might be coming out of them.
The BBC's Katya Adler in Jerusalem says more details of the two have emerged.
Hamas spokesman Sami Abu Suhri told the BBC the men were members of the Palestinian Authority's security apparatus.
They were originally from Gaza, he said, but fled the Strip three years ago when Hamas took over the territory."
http://news.bbc.co.uk/2/hi/middle_east/8522595.stm
Most likely Palestinians involved, but I wouldn't be shocked if it was Mossad after all. I really don't know why this story is getting as much press as it is. This wasn't a large political leader killed. It was an arms dealer for a militant group.