Police in the southern Philippines said on Monday they had foiled a bomb attack at a busy port.
The bomb was disarmed after employees of the Superferry shipping company's ticketing office in Butuan city's port of Nasipit alerted maritime police to a suspicious package left on the premises, police said.
Ordnance experts called to the site found that the package contained a powerful bomb made from ammonium nitrate, an agricultural chemical used by insurgents to make explosives.
Regional police commander Chief Superintendent Jaime Milla said no one claimed responsibility for the attack, although Islamic militants as well as crime gangs specialising in extortion are known to operate in nearby provinces.
Milla said security had been stepped up at all ports and other key installations in the city to prevent any further attacks.
In 2004, Al Qaeda-linked Abu Sayyaf militants bombed a passenger vessel operated by Superferry on Manila Bay, killing over 100 people in the country's worst terrorist attack.