DUBLIN(AP) – Iceland's volcanic ash renewed its threat to European air space on Tuesday, forcing Ireland to shut services temporarily for the first time in 12 days — and reminding European leaders they still must improve their aviation coordination system. Aviation authorities shut down airports throughout Ireland, Scotland's Outer Hebrides islands and the Faeroe Islands for several hours Tuesday after unexpectedly strong and unseasonal winds drove a thick cloud of ash southward the night before. Irish air space reopened at 1 p.m. (1200GMT) and services were scheduled to return to normal as the ash kept moving south into the open Atlantic at too low an altitude to pose a risk to aircraft. Britain's National Air Traffic Service said there was no immediate threat of disruption to British airports, although the situation remained ""dynamic."" In Brussels, European Union transport ministers held an emergency meeting Tuesday to seek better coordination within the continent's patchwork of nationally controlled airspaces. Germany and France demanded binding EU-wide policies on ash levels that would allow planes to fly and determine when airports should be closed down and reopened across the 27-nation bloc.