The whistleblowing organization Wikileaks wants to catch those responsible for the murder of Democratic National Committee (DNC) staffer Seth Rich and are now offering a $20,000 reward for information.

Rich was fatally shot in the early morning hours of July 10 while walking to his Bloomingdale apartment in Northwest D.C.

Metropolitan Police Department officials said Rich was shot multiple times and while investigators have not established a motive in the case, they were looking into the possibility that his death could have been related to several recent robberies in the area.

However, it is widely speculated that Rich may have been the source of the DNC email leaks in July, and may have been murdered for it.

Wikileaks co-founder Julian Assange suggested on Dutch television that if Rich is the source of the 20,000 emails exposing the party’s sabotage of the Bernie Sanders campaign in favor of Hillary Clinton, he may have been killed over it.

However, when asked if Rich was a Wikileaks source, Assange refused to comment, merely saying they were investigating the circumstances surrounding his murder.

Rich worked as voter expansion data director at the DNC before he was shot twice on his way home on July 10. He died later in hospital.

“If it was a robbery — it failed because he still has his watch, he still has his money — he still has his credit cards, still had his phone so it was a wasted effort except we lost a life,” his father Joel Rich told local TV station KMTV.

Assange made his comments on Dutch television show Nieuwsuur. When asked why he was commenting on Rich’s murder, he said, “Because we have to understand how high the stakes are in the United States.”

Wikileaks offers a secure upload submission option in which no identifying data about a source is recorded, according to the whistleblowing website.

Under these circumstances, Assange and Wikileaks staff would not know who sent them the DNC emails.

Last month’s leaks revealed a fractured Democratic party with a pro-Hillary Clinton agenda, while her progressive opponent Bernie Sanders was still in the race for the party’s nomination.

Wikileaks also claimed on Tuesday that Ecuador were being pressured to end Assange’s asylum in their London embassy over fears the leak could damage the country’s reputation with the US.