The committee also heard evidence from Bruton Knowles, a property consultant company and Plymouth University.
Former Irish prime minister John Bruton condemned the bomb threat as "absolute barren thinking".
Richard Bruton, finance spokesman for the opposition Fine Gael party, called the budget "jobless and joyless".
However, Mr Bruton told the BBC he thought a formal treaty of accession would still be required.
"They play the tax codes one against the other, " Enterprise Minister Richard Bruton told national broadcaster RTE.
Mr Bruton called for urgent top-level talks between the British and Irish governments to discuss the threat from breakaway republican groups.
Eastgate Street, between Nettleton Street and Bruton Way, is already closed to traffic between 22:00 GMT and 05:00 on Friday and Saturday.
BBC: Gloucester street closure scheme extension to be trialled
Mr Bruton claimed he was told in private briefings by the Irish government that the power-sharing executive would have been restored on Friday.
Jeff Bruton, a hospital administrator, said all were treated and released except for one patient who was transferred to a hospital in Macon.
Ireland's right-wing nationalist party, Fianna Fail, led by Bertie Ahern, won a general election, beating the moderate-conservative Fine Gael, led by the outgoing prime minister, John Bruton.
Only this week parliamentary representatives from Meath, including former premier John Bruton, head of the Fine Gael opposition party, met Trinity College officials to discuss the possible move.
Ms Hyslop made her comments during an interview to discuss the view of former Irish prime minister John Bruton who believes Scotland "probably could" achieve EU membership within 18 months of a yes to independence.
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