The self-driving taxis in Tokyo are capable of navigating around intersections and changing lanes.
Japan has activated amphibious troops, in a first since World War Two, to defend its remote islands against any external threat.
People in Japan had a scare last week when the public broadcaster mistakenly issued a missile launch alert. But Tokyo officials are not taking any chances—they held a drill, in case an attack does happen.
Mayuko Matsumoto, 82, was found in her home covered in blood with about 20 cuts to her face.
No tsunami warning has been issued.
The couple had previously been warned by police to stay away from each other following a dispute over their child.
The blasts took place at a park in Utsunomiya, some 100 kilometres (60 miles) north of Tokyo.
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