David McCullough was back on air from the RTÉ mobile unit after a bomb hoax forced staff to evacuate Montrose.

The presenter, who was forced to leave the studio while live on air, quipped, ‘Up yours,’ when he finally returned to the airwaves about 30 minutes later.

Speaking to Taoiseach Micheál Martin shortly after returning to the studio, David McCullough asked Mr Martin for his opinion on these threats and how they should be dealt with.

The Taoiseach said all these threats should be taken seriously and that everyone’s safety is paramount. He assured the public that cyber aviation authorities are working to find out who is behind these threats and said they will be held accountable.

Micheál Martin said hybrid cyber attacks are the subject of EU meetings across the European Union right now. He said: ‘All countries in the EU share intelligence and information, and in the era we find ourselves in, we are currently focused on safety, and those with expertise will pursue this.’

The Taoiseach advised all employers to take these threats seriously and refer all suspect emails and threats to the Gardaí.

Asked if he was particularly worried about the number of dignitaries coming to Ireland next week, Micheál Martin said, ‘ We are working hard towards next week, and it does highlight the security stakes are higher than they have been in Ireland, but our ultimate priority is being in a position to hold these meetings, and Defence Forces and Gardaí are to be commended for their work towards the coming week. Mr Martin added he is confident in our capacity to host these dignitaries next week.

But when he was asked whether he believed Russia is behind all these threats, Micheál Martin said he would not comment on who might be responsible.

David McCullough was also joined by his colleague from Lyric FM, the legendary Marty Whelan.

The morning presenter said he was doing his early-morning music show as usual when Dan Healy, head of 2FM, calmly entered the studio and said, ‘Out, out, bomb scare,’ and everyone had to leave the building.

Marty Whelan added that in all his years he has never seen anything like this, to see everybody outside the building, and added that this is a very worrying trend in the world we live in.

Over on Newstalk, Claire Byrne spoke to Fianna Fáil’s Tourism and Aviation Spokesperson Cathal Crowe, about their own bomb alert.

She said: ‘We here took advice from Gardai on this. We were advised that it was safe to come back into the building, that this was judged to be a hoax, and I know out in RTÉ they’re still dealing with this right now, and that the searches are continuing.

‘I’m sure they’re acting on good advice too, and on the authority of those who know what they’re talking about when it comes to this.

‘But this is why these things are so debilitating: you have to go when that alarm goes or when the warning comes in, you can’t get back in, or back on air, or back to your business, or back in the skies until it’s deemed safe to do so. So that’s why, when we look ahead to events like the EU summit, we see how easily it could be disrupted.’