A total of 36 hours passed before the missiles were properly secured, officials have said.
"The marble tile didn't appear to be properly secured," said Jennifer Givner, a Buildings Department spokeswoman.
Earlier, Mr. Burkhardt, who did not respond to several requests for comment, said the train had been properly secured.
"Claims that depots holding Manpads and other dangerous weapons are still not being properly secured are very worrisome and should be thoroughly investigated," Mr. Schroeder said.
Investigators have repeatedly been denied access to the site, which is under the control of pro-Russian separatists and has still not been properly secured.
If the windows of the boat are properly secured, and the boat flips upside down in high seas, it will return to an upright position.
Yesterday, Dr. John Kornblum, chief of the Health Department's molecular testing laboratory, said that their masks may not have been properly secured, or perhaps there were gaps in their gowns.
In Israel, Prime Minister Benjamin Netanyahu confirmed in comments to his cabinet that Israel was "in contact with the Egyptian government regarding the necessary procedures for returning our ambassador so that he and his staff will be properly secured".
Ensuring that devices were properly secured, including the use and updating of antivirus software, was the best way of keeping them safe from this and other attacks, experts said.
Suggested fixes include checking that the console's hard drive is properly secured, booting the system to Safe Mode (achieved by pressing and holding the power button for seven seconds after powering the console down) and checking for software updates.
