The two ships set sail early on Tuesday from Sfax toward Europe across the Mediterranean, according to the report.
Among the 140 rescued sub-Saharan migrants were two Tunisian nationals, National Guard spokesperson Houcemeddine Jebabli told TAP.
Search operations are still underway in cooperation with the army, the spokesperson added.
Deadly incidents involving migrant boats are a regular phenomenon in the Mediterranean off Tunisia's coast.
