The Balearic Islands, a popular destination for tourists, has stepped up its security after the Barcelona attack.
Armed police were seen at the airport at Palma de Mallorca, the Balearic capital, as well as on the streets.
Later police shot dead five would-be attackers after confronting them early on Friday in a town, south of Barcelona.
Islamic State claimed responsibility for the attack.
In the mean time, Thursday’s attacks in Spain has led to a sweeping anti-terrorism operation across the country.
Officials believe the van attack in Barcelona, and another in nearby Cambrils were coordinated.
Hillary Nnoruka reports that Barcelona’s most famous avenue in Las Ramblas is usually crammed with tourists, but early Friday morning just a few people walk its length, some of them laying out candles and flowers to pay tribute to victims of Thursday night’s attack.
A suspected militant drove a van into crowds right here, killing 13 people before fleeing.
Authorities say the death toll could rise, with more than 100 injured. And as security forces hunt for the van’s driver, who was seen escaping on foot, police now say they killed five attackers moments later in Cambrils, a town south of Barcelona.
Six civilians and a police officer were injured in Cambrils when the attackers ran them over in a car, before police shot them dead and carried out controlled explosions.
Authorities believe both incidents are linked.
Spanish Prime Minister Mariano Rajoy convened a security meeting Friday with the interior minister and other government officials.
A sweeping anti-terrorism operation has been launched with Police saying they have arrested two men, a Moroccan and a man from Spain’s enclave of Melilla, though neither was the van driver.