In a blow for Tunisia's crucial tourist sector, MSC Cruises and Costa Crociere said none of their boats would berth in the north African country's capital until further notice because of the security risk.
Most of the 20 foreign tourists killed in yesterday's attack on the National Bardo Museum were passengers on the boats.
Both cruise liners left Tunis today for their next scheduled stops, apparently intent on completing their cruises despite having to provide trauma counseling for some of those on board.
"We have not seen a wave of cancellations of trips to Tunisia," said Rene-Marc Chikli, president of the union of French tour operators (SETO).
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"I'm not saying there haven't been any but customers appear to have been supportive. We have had some asking questions today, but also some making reservations."
Nine passengers on the MSC ship that was in Tunis when the attack occurred yesterday were among at least 20 foreign tourists confirmed to have died.
The passengers who lost their lives were said to be three Japanese, two Colombians, two Spaniards and two French nationals.
A further 12 passengers were injured and six had not returned to the MSC Splendida when it left Tunis today morning, bound for Barcelona.
Three passengers on the Costa Fascinosa died, the company's CEO Michael Thamm said in a statement. Eight others were injured and two remain unaccounted for. The nationalities of the deceased were not released.
The ship set off from Tunis in the early hours for the Spanish island of Mallorca.
MSC also had three boats scheduled to dock in Tunis in the near future.