Muscat (modern day Oman) quarantined five subjects who held French papers. The subjects escaped and were recaptured by Great Britain. France demanded that the men be released. In 1904, France and Great Britain agreed to arbitrate the dispute on the condition that, among other things, the rights of certain non-native ships to fly the French flag be included in the arbitration. In 1892, the countries had ratified the General Act of the Brussels Conference of 1890, which prohibited a country from authorizing non-native vessels to fly its flag. The prohibition was agreed to in an attempt to minimize the slave trade.