PORTUGAL has extended restrictions on travel via land and sea to Spain that had been due to end this weekend until April 15 as it works to contain the spread of COVID-19. The two countries imposed the restrictions on January 28. The interior ministry said the restrictions would remain in place for a further 11 days, adding that the measures did not prevent citizens or residents of Portugal from entering the country. Vehicles transporting goods, emergency vehicles and seasonal border workers are also exempt. Nationals from Britain, Brazil and South Africa - where more contagious coronavirus variants were first detected…