Original sentence: On 23 September 2004 Slovenia threatened with a veto of Croatia's EU accession after an incident where Croatian border police maintained 12 Slovenes, among them leader of the opposition SLS Janez Podrobnik, after they refused to show their IDs at the Sečovlje in the disputed zone of the Piran Bay
Edited sentence: It is to be noted that no action was taken by Slovenia at that time.On 23 September 2004 Slovenia threatened with a veto of Croatia's EU accession after an incident where Croatian border police maintained 12 Slovenes, among them leader of the opposition SLS Janez Podrobnik, after they refused to show their IDs at the Sečovlje crossing point, notably they haven't attempted to cross the Croatian border checkpoint, and were arrested while returning to Slovenia