Argentina’s military and federal police scrambled to deal with a bomb threat made against the presidential palace in Buenos Aires while President Mauricio Macri was there on Monday, just hours after a man was arrested trying to enter the building with a gun, a presidential spokesperson says.

The threat against Casa Rosada was made by phone. The caller indicated a plan to put a bomb inside a car, the office of Argentina’s secretary general confirmed to Reuters.

The military activated its protocol for such threats, and a team was dispatched to check and secure the entrances of Casa Rosada, the presidential palace and seat of national government. No car containing explosives was found, and the building was not evacuated.

“There is no possibility of a bomb entering without detecting it,” an official from the office of the secretary general said.

Local media reported that another threat was made against a congressional office and a response team was also on the scene there.

Argentine President Mauricio Macri was at the presidential palace for much of the morning. No explosive devices were ultimately found by authorities. (Agustin Marcarian/Reuters)

The bomb threat followed the arrest of a man carrying a gun who claimed to have a meeting with Macri, the president’s office said in a separate statement. The city has faced false bomb threats before, including ahead of a G20 meeting there last year.

Security personnel said Francisco Ariel Muniz, 36, had tried to enter the building with a .44 Magnum Taurus revolver inside his briefcase and told officials he was there for an appointment with centre-right leader Macri.

Weapon not loaded

After officials confirmed that no such meeting was scheduled, he tried to leave the briefcase behind. The statement said Muniz was detained by security personnel. Security Minister Patricia Bullrich tweeted that the gun was not loaded.

Macri, who came into office in 2015, will seek re-election in October in what is likely to be a closely fought battle. He has been falling in opinion polls amid high inflation and a tumbling peso that has hurt voters in the recession-hit nation.

Lawmaker Hector Olivares died on Sunday, three days after he was shot. His travelling companion was also gunned down in the attack in Buenos Aires on May 9. (Nation’s Honorable Chamber of Deputies, HCDN via AP)

An attack outside Argentina’s Congress last week led to the deaths of a senior lawmaker and an aide, though local officials and media have indicated the motive behind the “Mafia-style” shooting was personal rather than political.

The aide, Miguel Marcelo Yadon, died on May 9, the day of the attack.

Hector Olivares, a member of Congress, died on Sunday from his injuries. A wake was held for Olivares on Monday, attended by Macri and other legislators.

At least six people have been detained in connection with the attack, although charges have yet to be announced.