Cybersecurity firm fails to find links between Donald Trump and Russian bank

Investigators hired by Alfa Bank say server logs show no sign of secretive contact after online report sparks debate between internet security experts

A US cybersecurity firm hired by a Russian bank to investigate allegations of a secret line of communication with the Trump Organization said on Tuesday there was no evidence so far of substantive contact, email or financial links.

Mandiant, which is owned by the California-based company FireEye, said it examined internet server logs presented to the bank by media organisations investigating the link.