Police in the UK say they believe efforts to disrupt and sabotage train services in England were related to Brexit.
British Transport Police have been investigating two cases of 'malicious obstructions' on the railway last month.
One incident happened near Yaxley in Cambridgeshire on March 21st, and another at Netherfield in Nottinghamshire on March 27th.
Rail workers discovered devices on the tracks, with police saying the objects were intended to cause disruption to railway services.
Authorities say the "failed" efforts were attempts to delay services rather than cause damage to the infrastructure.
In a statement, Sean O'Callaghan of British Transport Police explained: "This was a serious and deliberate attempt by someone to cause significant sabotage and disruption to Britain’s rail network.
"We’re are currently keeping an open mind on why someone would put their life at risk to place these items on a live railway, however our early assessment has led us to believe it relates to Britain’s exit from the European Union."
He added that officers are "working tirelessly" to identify those responsible.