The explosion occurred at 11:45 p.m. Wednesday and the blast wave extended 30 meters (98 feet).
“The device was placed beside a column of the building and it reached windows of the El Mercurio offices and of contiguous apartments,” police Col. Fernando Bywaters told reporters.
No one was hurt and there has been no claim of responsibility for the bombing, he said.
The blast took place one block from Viña del Mar city hall and in the vicinity of two educational institutions.
Fifteen Chilean anarchists – including one serving time for other offenses – are currently accused of carrying out 23 bombings in Santiago and other cities.
The attacks targeted banks, offices of foreign companies, embassies, churches and police stations, mainly in the capital. The sole fatality was an anarchist killed when a bomb exploded as he was transporting it on a bicycle.
Santiago-based El Mercurio is Chile’s most influential newspaper and a pillar of the Andean nation’s conservative establishment. EFE