Two robbers who murdered a shop worker at a Manchester off-licence went on to commit another robbery less than two hours later, police say.
Mr Van Le leaves a wife and two children
Greater Manchester Police is offering a £10,000 for the arrest and conviction of the pair who shot Thuy Van Le, 32, at Spanish Wines in Old Trafford.
The pair robbed another off-licence in Moss Side within an hour-and-a-half of leaving Mr Van Le dying on the floor.
Police say the two men, who wore masked, are "extremely dangerous".
Mr Van Le was shot in the chest at the shop on Skerton Road at about 1900 GMT on Thursday.
His brother said Mr Van Le was working there because he did not want his brother's wife working alone.
Mr Van Le was left dying on the floor of the shop
"He was acting as her protector," he said.
At 2030 GMT, the same men threatened a shopkeeper with a gun at McFresh Bakery and off-licence at Claremont Road, Moss Side.
Det Supt Martin Bottomley, of GMP, said: "I am convinced that these men will re-offend if we do not catch them.
"They are extremely dangerous and the fact that we have now linked the murder of Thuy to the second incident later the same evening, suggests that this was not the first or last time these men will strike."
Mr Van Le was from Vietnam and had been living in the UK for two years.
Greater Manchester Police say he had temporarily left his home to make a better life for his wife, Miet and sons Manh, 8, and Cuong, 2.
His brother Phong Van Le said: "He was a strong kind man."