A 61-year-old man has gone on trial at the Dublin Circuit Criminal Court for sending hoax bomb threats to Heathrow Airport in 2006.
Adam Busby, from Sackville Avenue, Ballybough in Dublin, denies sending the emails, which purported to warn of bombs on board two flights from London to New York in May 2006.
The emails bore the subject line 'bomb on aircraft' and 'urgent bomb' and contained real flight numbers and destinations.
The emails said bombs would explode on the New York-bound planes while they were in the air. They were received when the flights had already taken off.
The jury was told that an investigation showed the emails sent to Heathrow Airport's media centre on 8 and 25 May 2006 were sent from computers at a Dublin City Library used by the defendant.
The computers were for public use and it is alleged that Mr Busby was registered to and was using the computers at the time the emails were sent.
Analysis also shows that other information connected to the emails, such as live flight information for Heathrow Airport, was accessed from the same computer. The jury will be shown CCTV footage from the library.
Mr Busby denies two charges of sending false messages for the purpose of causing annoyance, inconvenience and unnecessary anxiety.
A number of witnesses will also be called from Heathrow Airport where the emails were received.
The case is expected to last until next week.