Police are asking for the public's help in gathering more information that could lead to a conviction of Stephen Port, the 40-year-old London chef accused of killing four gay men in their 20s over a period of 14 months.

Related: Alleged Serial Killer Charged With Murdering Four Gay Men

The alleged serial killer is said to have killed his victims by poisoning them with lethal doses of GHB after meeting them on gay dating sites.

The bodies of all four victims, Anthony Patrick Walgate, 23, Gabriel Kovari, 22, Daniel Whitworth, 21, and Jack Taylor, 25, were found in the St Margaret’s Church courtyard in east London between June 2014 and September 2015.

Port was arrested in October after he was linked to the crimes, and currently awaits trial on four counts of murder and four counts of administering a poison with intent to endanger life or inflict grievous bodily harm.

In an unusual plea to the public, Scotland Yard Detective Chief Inspector Tim Duffield said he'd like to speak with "anyone who has knowledge" of Port:

"We are keen to speak to anyone who may have information in connection with these incidents, no matter how insignificant you may think it is.

If you have any reservations about speaking to the police, please rest assured that your call will be dealt with in the strictest confidence.

For anyone who feels anxious about talking directly to the police, I would urge them to speak to organisations such as Galop, a specialist charity that supports LGBT people affected by violence and abuse.

They will be able to facilitate appropriate support and advice, maintain confidentiality and treat anything you tell them with the utmost sensitivity."

Port's trial is set to being in April 2016.