( dpa ) - Portugal stepped up security at airports and frontiers Monday after Spain warned it of a possible risk of Islamist attacks, Interior Minister Rui Pereira said.
Twelve Pakistanis and two Indians were detained in Barcelona over the weekend.
They had planned four attacks, including one on a Barcelona mosque which was popular among supporters of the slain Pakistani former prime minister Benazir Bhutto, according to Spanish television reports.
The group had instructions from high-ranking al-Qaeda members in Pakistan to carry out suicide attacks in Barcelona, the daily Periodico de Catalunya reported.
Two Pakistanis linked to the network could have passed through or still be in Portugal, according to Spanish police.
There were fears that Pakistani President Pervez Musharraf's visit to Brussels on Monday could increase the risk of an attack in Europe, Portuguese police sources were quoted as saying.
Pereira called an urgent meeting of the Security Coordination Cabinet (GCS). The police team was to review the security situation, though there was no information about the possible presence of the Pakistani suspects in Portugal, GCS Secretary General Leonel de Carvalho said.
"We don't have any indications pointing to a major risk," he said.
Prime Minister Jose Socrates earlier said that Portugal took all terrorist threats "very seriously," though there was no "special threat" for the country.
The GCS last met several months ago over the discovery that members of the Basque separatist group ETA had hired cars in Portugal in order to stage attacks in Spain.