MIAMI -

Police on Tuesday questioned a subject who may have been involved in an armed robbery at a northwest Miami-Dade County nail salon that killed a 10-year-old Aaron Vu.

Sources told Local 10 that police picked up the man at a duplex in northwest Miami-Dade County. A neighbor said police arrived at 3 a.m.

Crime scene detectives and a K-9 officer searched the back unit of the duplex, the yard, and the roof. They left with five evidence bags.

House

No charges have been filed.

Surveillance cameras captured two men firing gunshots while entering Nail Hong-Kong last Friday. Vu and his father, Hai Nam Vu, were shot.

The boy was pronounced dead upon arrival at Jackson Memorial Hospital. Nam Vu, 42, remained in intensive care Tuesday.

Following Monday's plea from the Vu family to help find the two men, Miami-Dade Crime Stoppers upped the reward for any information leading to their arrest to $25,000. Since the reward was raised, sources say police have received more than 100 tips, the largest response anyone can remember.

"Let today be the day that we turn the tide in this community against this coward's code called no snitching," said Dick Masten with Miami-Dade Crime Stoppers.

"Help me. Help me find the bad guy," said the boy's uncle, Loc Ma. "Please help us find the human who did a horrible thing like this."