A convoy of British and US diplomats was attacked at gunpoint in Zimbabwe today, the US embassy said.
A spokesman said the officials were attacked as they were on a trip to investigate political violence.
Their car tyres were slashed and one US Embassy worker was beaten, he said.
The group was held at a roadblock in rural Zimbabwe.
US Ambassador James McGee, who did not go on the trip, was pressing Zimbabwean officials to release them.
The embassy spokesman said: "They are still holding five Americans, two Zimbabwean staff and four Britons, almost five hours after the incident.
“The Ministry of Foreign Affairs promised to send staff to get our people out, but they are still being held at the roadblock.”