One person has been slightly injured after the boats hit each other.
A video posted online shows the two Carnival Cruise Line ships crashing into each other, damaging the stern on one vessel, in the port of Mexico's island of Cozumel.
No other serious injuries have been reported while the cruise operator says their itinerary remains unaffected.


Krakow mass shooting assailant dies in hospital, Polish police say
Nvidia's out-of-hour shares fall as firm probes CEO Jensen Huang
Lawyers for Philippine VP Duterte open defence in high-stakes trial
COP31 summit leaders urge world to move faster on climate
Delhi air quality deteriorates as revellers mark Diwali with illegal fireworks