"People need to start watching what is happening with their neighbors," Boubacar Sidiki Samake told The Associated Press on Tuesday, adding that future attacks could be better prevented only if Malians "changed their behavior."
Samake, though, provided very little new information about the probe of Friday's assault that killed 19 people.
Yesterday, state television broadcast the photos of two gunmen killed in the attack and urged anyone with information to come forward.
But officials have yet to confirm their identities and said they did not know if the attackers were based in Bamako before the attack.
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Today, a United Nations police official displayed the assault rifles to journalists in Bamako, but said they had been handled by too many people to yield useful fingerprints. "With the serial numbers... We can trace whether these come from the Malian army stock, which was looted in 2012, or if they were imported illegally," said the official, who gave only his first name, Laurent, in line with the policy of his division.
Noting that Islamic extremists also shot up a Bamako bar popular with foreigners in March, Samake said security threats in the city were "very high."
Yesterday, UN spokesman Stephane Dujarric said the UN mission in Mali had offered help with the investigation and had joined Malian security forces in conducting night patrols in the city.
Also today, Mali's UN mission reported that a civilian staff member was killed in the northern region of Timbuktu when a vehicle drove over an explosive device. The incident occurred just before noon about 25 kilometres west of Timbuktu, mission spokesman Olivier Salgado said.