Frustrated families of passengers who disappeared on Malaysia Flight 370 held 10 Malaysia Airlines workers hostage for almost 11 hours at a Beijing hotel yesterday.

NBC News reported the group of 200 relatives said they were dissatisfied with the information given to them about the hunt for the missing jetliner, which disappeared March 8 on a flight from Kuala Lumpur to Beijing.

It is thought the plane crashed in the southern Indian Ocean but repeated searches have turned up no evidence as to what happened to the plane and its 239 passengers.

Meanwhile, Pentagon spokesman Army Col. Steve Warren said the U.S. has spent $11.4 million searching for the jetliner. The figure includes $4,200 per flight hour for the two P-8 Poseidon aircraft assisting in the hunt. The amount also includes $3.2 for humanitarian disaster and civic aid funds and $3.6 million for underwater search equipment.

The P-8s continue conducting aerial search operations, and the Bluefin-21 autonomous underwater vehicle completed its 12th search mission, Warren said.

"Bluefin-21 has now completed more than 90 percent of a focused underwater search ... . Unfortunately, no contacts of interest have been found," he said.

The Pentagon has received no requests for additional underwater search assets, Warren said.