According to Zimbabwean local newspaper The Herald, thousands of demonstrators have already gathered around Harare for a day of anti-sanction protests.
The government has created a public holiday today in light of the marches.
The FCO has warned visitors to avoid the protests, adding they may “turn violent without notice”, are “unpredictable”, and could provoke a “disproportionate” response from security forces.
It also advised that taking pictures of police, armed forces, or of the protests is not allowed.
“You should exercise a high degree of caution and monitor local media and this travel advice for updates,” the FCO added.