Police officers stand guard in the car park of the Fir Tree pub in Croxteth, where Rhys Jones was killed on Wednesday at about 1930 BST.
A witness said three shots had been fired by a youth, wearing a hoodie, who had ridden past on a BMX bike.
Two teenage boys were arrested on suspicion of murder. They were bailed.
Rhys, 11, was shot dead on his way home from playing football.
On Thursday, youngsters, including schoolfriends of Rhys, laid flowers close to the spot where he was shot.
More friends arrived to pay their respects with floral tributes.
Rhys's parents made an emotional plea for information, saying their son had been no threat to anyone.
The killing has brought into focus the problem of gangs in Liverpool's estates.
This message makes reference to Rhys's favourite football team, Everton, and features the club's crest.