Coastguards were alerted to people aboard makeshift vessels around 17 nautical miles (30 kilometres) from the western city of Sabratha, the journalist said.
The migrants were transported to a safe zone nearer to the capital Tripoli.
Libyan coastguards earlier today that they had detained 550 people trying to reach Europe illegally by boat.
It was the second time in three days they have intercepted migrants in the same area.
"Coastguards in the west who were patrolling off the Zawiya refinery on Tuesday intercepted four large inflatables carrying around 550 illegal migrants," navy spokesman Colonel Ayoub Qassem said.
"The migrants have been handed over to the relevant authorities to be taken to detention centres," Qassem said.
On Sunday, Qassem said coastguards had intercepted seven vessels carrying around 850 migrants, again off Zawiya which is some 45 kilometres (30 miles) west of the capital Tripoli.
The chaos in the North African country since Moamer Kadhafi's overthrow in 2011 has been exploited by people traffickers, with thousands of migrants trying to reach Europe from Libya just 300 kilometres (190 miles) from Italy.
On Monday, Italy's coastguard said two Italian naval vessels and two operated by Doctors Without Borders (MSF) rescued around 2,000 migrants from unseaworthy boats in 15 separate operations.
An Irish navy ship rescued hundreds more, as did a passing cargo ship, the Italian coastguard said.
So far this year more that 34,000 people have been brought to the Italian coast after being rescued off Libya, according to the UN refugee agency.
A May 13 British parliamentary report said the EU's naval mission to combat people trafficking off Libya was "failing" and succeeded only in forcing people smugglers to change tactics.
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