A man and a woman have been arrested in Nice in connection with the Bastille Day lorry attack, French judicial sources have said, according to BBC News.
It brings to six the number of people still being held over the attack, BBC News reports.
A source close to the investigation told French news agency AFP that the killer had visited the area on the previous two days to prepare for the attack.
As UNIAN reported earlier, over 80 people died when a 31-year-old Frenchman of a Tunisian man drove a truck into a festive crowd on the seafront Promenade des Anglais Thursday evening on Bastille Day.
The attacker was shot dead by police forces.
Earlier, France called up 12,000 police reservists to boost security in the wake of the killings, BBC News wrote.