Note:
(a) "北医医师急救时发现，送到该院的五位伤者中，只有林英昌胸部、腿部都出现点状伤口，经电脑断层扫描，发现伤口裡有金属碎片" which were collected to compare with materials of explosive devices. He was seriously injured (including burns on his exposed area (not covered by clothes), such as mouth cavity [which breathed-in hot air reached from the back], the airway to lungs) -- because he did not use a fuse to ignite explosive devices.
(b) From there, his cellphone supplies through GPS his whereabouts, tracing all the way to the minivan 厢型车 (Taiwan uses traditional characters for the same term), in which he had lived.
Note: "Chris Buckley 储百亮" has an English-only Twitter account (but no Chinese-language account): https://twitter.com/chubailiang
(a) July 6 on the same photo as the one in 法广: "Why stand in the water when there are steps just behind you?"
(b) Later also on July 6 with another photo that appears to show prime minister Li in front of two steps of a stair (from another angle of the same locale perhaps): "He sure does like standing in water."