Prime Minister John Key says New Zealand embassy officials in Jakarta are checking hospitals for any New Zealanders caught up in Friday's hotel explosions.
One New Zealander, businessman Timothy David Mackay, chief executive of PT Holcim Indonesia, was killed in the attacks, and another is thought to have been wounded.
Mr Key says that if people can't make contact with family and friends in Indonesia they should call the Ministry of Foreign Affairs and Trade (MFAT) in New Zealand.
Meanwhile the ministry has renewed its travel advisory for Indonesia. On its Safe Travel website it urges New Zealanders in Indonesia to exercise a high degree of personal security awareness at all times, keep a low profile and avoid any unnecessary travel through Jakarta.
Australia has issued a fresh travel warning, telling its citizens to reconsider going to Indonesia because of the very high threat of terrorist attack.
281 New Zealanders are registered with MFAT as currently in Jakarta.
Embassy staff had just started work for the day
The New Zealand Ambassador in Jakarta, Phillip Gibson, says the explosions occured shortly after his office had started work on Friday. Staff immediately began trying to contact any New Zealanders living in the city.