The program is technically complex and politically explosive.
One crucial task, officials said, was to piece together how the suspect was able to accumulate the weapons used in the shooting as well as the materials needed to assemble the complex web of traps and explosive devices in the apartment.
"This is a very complex fire, with multiple fronts and explosive conditions".
McKidd said: "Between him [Owen] and her [Cristina], it's going to get really complex and kind of tense and explosive".
Where environmental conditions were permitted, early human agricultural societies followed the same pattern as a few social insects and exhibited explosive population growth, complex and detailed division of labor, intensive resource exploitation, territorial expansion, and a social organization favoring the survival and growth of the supergroup over the well-being of individuals within the group.
The Times's Michael S. Schmidt spoke to a federal law enforcement official late Friday night who said that studying the complex series of tripwires and explosives using video surveillance and what they could see without entering, law enforcement officials had yet to figure out a way to safely handle the devices.
A complex volcanic environment is thought to have existed with emission of large lava flows and explosive eruptions.
The trio allegedly stockpiled guns, ammunition and explosive materials, and discussed parking four explosive-filled vehicles outside an apartment complex largely inhabited by Somali immigrants.
The bombers drove a tanker truck packed with 5,000 pounds (2,268 kg) of explosives near the complex and then jumped into waiting vehicles, escaping just before detonation.
Complex ammonium nitrate-based NP and NPK fertilizers are multicomponent salt systems prone to high hygroscopicity, caking and explosive thermal decomposition.
