Police were called to a report of “possibly two illegal immigrants” found hiding in the luggage hold on a coach which had just returned to the UK from a school trip to France.
Hampshire Police told Sky News its officers attended Hounsdown School in Totton on Saturday.
According to reports, the coach had just brought pupils home from a trip to Boulogne University, located around 20 miles south of Calais, when the discovery was made as luggage was being unloaded.
The coach is understood to have travelled back into the UK via the Eurotunnel at Calais.
Children from years nine and 10 had been on the trip, according to the Daily Echo.
A parent said two men were found with the luggage – one had apparently tried to run off, the Echo reported.
One parent said the incident was “horrendous”, according to the newspaper.
The Home Office did not comment specifically on the incident, but a spokesperson told Sky News: “The government works closely with law enforcement agencies to tackle illegal migration in all its forms.
“Our Illegal Migration Act will mean that people arriving in the UK illegally are detained and promptly removed to their country of origin or a safe third country.”
Hampshire and Isle of Wight Constabulary said: “We were called just before 5.15pm on Saturday to reports that two people, who were possibly illegal immigrants, had been found at Hounsdown School in Totton.”
No arrests were made, a spokesperson added.