Royal Mail has launched an investigation after sorting office staff appeared to be high on drugs after eating snacks from an unclaimed package.

A video was uploaded to social media on Tuesday (February 1) morning which showed postal workers at a delivery office in Clapham, south London.

They appeared to be struggling to stand after consuming the cannabis-laced snacks.

As reported in The Guardian one of the postal workers appeared bewildered and had to be helped with his delivery trolley. A colleague could be heard advising him: “You’re just really high.”

St Albans & Harpenden Review: Royal Mail were launching an inquiry into the video (PA)Royal Mail were launching an inquiry into the video (PA)

The video showed the office had been a sent a package marked “Edibles by Pablo Chocobar”.

A caption said the package had laid unclaimed for a month marked with an address from a house that was empty, it said.

Royal Mail is considering disciplinary action and there have been unconfirmed reports that the staff members in the video have been suspended.

In a statement a spokesperson for the postal service said: “Royal Mail expects the highest standards of behaviour from our people at all times. We are taking this matter very seriously.”

It added: “We have commenced an investigation, which will determine whether any further action, including disciplinary action, might be taken. We are also reminding all staff at the delivery office of the correct procedures for dealing with items with no address for delivery or return.”

Royal Mail confirmed that no one has suffered any problems with health or wellbeing since the incident.