Authorities in Dallas are questioning family members about how Micah Johnson was able to stockpile a vast amount of bomb-making equipment at his home, as it emerged that two more officers were wounded in last weeks shooting than was previously known.
Five officers died and nine were wounded in the shooting last Thursday, during a protest against the deaths of African American men in confrontations with police officers. Authorities had previously stated that seven officers were injured. Two members of the public were also hurt.
Police chief David Brown said on Monday that bomb technicians had been alarmed by the scale of Johnsons collection of explosives at the house in the suburb of Mesquite that he shared with his mother, Delphene.
Delphene Johnson has been questioned, according to Brown, but not detained. Asked by a reporter how it was possible that his family could not know about him stockpiling weapons, Brown said: Thats my question.
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Brown said investigators were trying to establish whether Johnson, 25, had developed expertise in bomb-making online or elsewhere.
He knew what he was doing this wasnt some novice, said Brown, adding: We dont think he learned it in the military.
Police have said Johnson declared during negotiations that he planned to perpetrate many more killings, before police killed him with a remote-controlled, bomb-carrying robot. Johnson was an army veteran and had explosives that police said could have been devastating to the region.
Speaking at a news conference on Monday, Brown said investigators had not ruled out the possibility that Johnson was connected to a wider threat against the city.
The concern is that we havent found something thats out there, he said.
