Lt. General Dhahi Khalfan Tamim did not directly implicate Israel, as the Islamic militant group has. But the details he released at a news conference in the Gulf emirate are the most comprehensive accusations by Dubai authorities since the body of Mahmoud al-Mabhouh was found January 20 in his luxury hotel room near Dubai's international airport.
Tamim said it was possible that "leaders of certain countries gave orders to their intelligence agents to kill" al-Mabhouh, one of the founders of Hamas' military wing. But he did not name any countries.
Hamas has accused Israel and vowed revenge.
Tamim sketched out a highly organized operation in the hours before the killing, clearly done with advance knowledge of the victim's movements, and said the killers spent less than a day in the country. He said forensic tests indicated al-Mabhouh died of suffocation, but lab analyses were still under way to pinpoint other possible factors in his death.
He showed the news conference surveillance video of the alleged assassination team arriving on separate flights to Dubai the day before al-Mabhouh was found dead. The members of the alleged hit-squad checked into separate hotels and wore disguises that included wigs and fake beards during the operation, he said.
They paid for all expenses in cash and used different mobile phone cards to avoid traces, he added.
At least two suspected members of the team watched al-Mabhouh check in to his hotel and later booked a room across from the Hamas commander, Tamim said.
He added that there was "serious penetration into al-Mabhouh's security prior to his arrival" in Dubai, but that it appeared al-Mabhouh was traveling alone.
"Hamas did not tell us who he was. He was walking around alone," said Tamim. "If he was such an important leader, why didn't he have people escorting him?"
Tamim said there was at least one unsuccessful attempt to break into al-Mabhouh's hotel room. It was unclear whether he opened the door to his killers or if the room was forcibly entered.
The killing took place about five hours after al-Mabhouh arrived at the hotel and all the 11 suspects were out of the United Arab Emirates within 19 hours of their arrivals, he added.
Tamim claimed the suspects left behind some evidence, but he declined to elaborate. He urged the countries linked to the alleged killers to cooperate with the investigation and said the photos and other information were being sent to Interpol and posted on the Internet.
He did not say whether any of the suspects have been formally charged by prosecutors in Dubai, one of seven semiautonomous emirates that make up the United Arab Emirates.
Tamim told reporters the alleged assassination team comprised six British passport holders, three Irish and one each from France and Germany. Hamas has accused Israel's Mossad secret service of carrying out the killing and has pledged to strike back.
Britain's Foreign Office declined to comment Monday on the allegations while officials seek more information on the case and the individuals named by Tamim.
Israeli officials have accused al-Mabhouh of helping smuggle rockets into the Gaza Strip, the coastal territory ruled by the militant group.
A Hamas statement last month acknowledged al-Mabhouh was involved in the kidnapping and killing of two Israeli soldiers in 1989 and said he was still playing a "continuous role in supporting his brothers in the resistance inside the occupied homeland" at the time of his death.
Hamas initially claimed al-Mabhouh was poisoned and electrocuted. But Mohammed Nazzal, a Hamas leader, has given a somewhat different account, saying al-Mabhouh was ambushed by Mossad agents who were waiting for him in his hotel room. Nazzal said earlier this month that no poison was involved. But he gave no evidence to back up his charge of Mossad involvement.
Top Hamas figures have denied reports that al-Mabhouh was en route to Iran, which is a major Hamas backer. But the group has not given clear reasons for his presence in Dubai.
Earlier this month, Hamas said it launched a floating explosives into the Mediterranean Sea to drift toward Israeli beaches to avenge al-Mabhouh's death.
Israeli authorities discovered at least two explosive-rigged barrels and launched an intensive search for new bombs, closing miles of beaches and deploying robotic bomb squads.
More than 2000 mourners attended al-Mabhouh's funeral and burial at the Palestinian refugee camp of Yarmouk, near Damascus, Syria.
