Update: (March 23, 2015 at 1:02 p.m. EDT) -- Princess Cruises has canceled Emerald Princess' May 2015 call to La Goulette, replacing it with Naples, Italy. "Scheduled calls beyond this sailing are being evaluated," it said in a statement.
Update: (March 21, 2015 at 6:12 p.m. EDT) -- Holland America is the latest line to cancel calls to Tunis. It has removed the cruise port from three itineraries through the end of May, 2015.
Alternate calls include Cagliari, Sardinia, on Eurodam; and Olbia, Sardinia, on Zuiderdam. "Scheduled calls to La Goulette, Tunisia, beyond the end of May will be evaluated as the sailing dates get closer," the line said in a statement.
(1:30 p.m. EDT) -- MSC Cruises and Costa Cruises have canceled all port stops to Tunisia for the rest of the year following the terrorist attack in the capital March 18th.
MSC Splendida -- which left Tunisia today -- will call at Valletta, Malta, for the rest of the season. MSC Fantasia will call at Palma, Mallorca; MSC Preziosa will call in at Cagliari, Sardinia; and MSC Divina will call at Valletta a day earlier and head directly to Corfu, Greece.
Costa has also canceled all remaining 39 port stops to the country. In lieu of Tunis, Costa Fortuna will call at Barcelona, Spain; Costa Favolosa will call at Barcelona and Tarragona, Spain; and Costa neoRiviera will call at Malta and Trapani, Italy.
Hapag-Lloyd Cruises has canceled Europa's port stop in Tunis on April 6, 2015. Star Clippers has canceled port calls in Hammamet in April and October 2015 for Star Clipper and AIDA has canceled all port calls in La Goulette for AIDAblu, AIDAsol and AIDAvita.
Four other lines -- P&O Cruises, Oceania, Holland America Line and Princess Cruises -- have ships scheduled to call in at Tunis this year.
A spokesperson for P&O Cruises said in a statement: "Following yesterday's tragic events in Tunis we are monitoring the situation and taking advice from relevant authorities. Should it be deemed necessary we will of course alter itineraries for cruises to Tunis accordingly and contact our passengers to advise."
Princess Cruises -- whose Emerald Princess has its first itinerary stop in Tunisia on June 1 -- is also "actively monitoring the situation."
Holland America Line stated "decisions pending" on Twitter. Cruise Critic has contacted Oceania Cruises, but the line has yet to respond.
MSC Cruises has confirmed 12 passengers travelling on MSC Splendida were killed, and Costa Cruises has confirmed five passengers on Costa Fascinosa were also killed.
A further 13 MSC Cruises passengers are confirmed as injured: one Belgian, seven French, four Japanese and one South African, two of which are in serious condition.
The last two missing MSC passengers -- a young Spanish couple -- were found safe after a night in hiding at the Bardo National Museum, where the attack took place. Cristina Rubio Benlloch, who is pregnant, was immediately taken to hospital and she and the child are reported well.
Costa Cruises confirmed eight passengers have been injured and are being treated in hospitals.
A year ago, Norwegian Cruise Line dropped Tunisia from its itineraries and will not return after the country refused Israeli citizens to disembark.
Cruise Critic will continue to monitor and update this news story.
--By Adam Coulter, UK Editor