Detectives in the Stephen Lawrence murder inquiry have received "significant information" after a fresh appeal.
Scotland Yard said the investigation team received "up to 30 calls" with information which is being followed up.
A reconstruction was aired on Crimewatch on Monday night, alongside media appeals.
Police are attempting to identify a woman whose DNA was found on a bag strap found at the scene where Lawrence, 18, was stabbed to death in Eltham, south east London, on April 22 1993. Officers have stressed the woman is a witness, not a suspect.
Detectives are also continuing to appeal for information about another possible witness - a man reportedly seen in a distinctive green jacket with a V emblem near Well Hall Road Roundabout at about the time Lawrence was attacked.
Chris Le Pere, the senior investigator in the case, said on Tuesday: "Given the length of time this inquiry has been running, I am happy with the positive result.
"Some of the calls hold significant information, and will take time to work through."
He also appealed for a male who rang Crimewatch and Crimestoppers in 2013 to contact the incident room on 020 8785 8310.
Le Pere added: "We are offering a reward of up to £20,000 for information leading to the identification and prosecution of persons responsible for the murder of Stephen Lawrence."
Lawrence was stabbed to death by a group of up to six white men in an unprovoked racist attack as he waited at a bus stop with a friend.
In January 2012, Gary Dobson and David Norris were found guilty of being involved in the attack and jailed.