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"We have been in contact with a small number of New Zealanders in Beirut to provide advice and support," a spokeswoman said.
"New Zealanders in Beirut should avoid the immediate area of the incident and remain vigilant."
All Kiwis on the ground registered on SafeTravel have been sent a message from Mfat, the spokeswoman said, and New Zealanders are once again being urged to register their names on there if they had not already done so.
A hotline for any New Zealander needing urgent consular assistance has been set up and is running 24/7.
People have also been advised of the phone number that has been set up by local authorities for missing persons: +9611832700.
New Zealand's ambassador to Egypt, Greg Lewis, is also giving alerts and advice to Kiwis on the ground via social media channels online.
Lewis said the embassy continued to monitor developments in Beirut and encouraged Kiwis in Beirut, in particular, to follow the guidance of local authorities.