UN spokesman Manoel de Almeida e Silva said four four-wheel-drive vehicles were damaged in the attack on the joint UN-Afghan electoral office at about 1.30am in which attackers fired three rocket-propelled grenades before escaping.
Arnault urged NATO to send more troops quickly.
NATO is due to hold a high-level meeting in Istanbul from June 28 to June 29 to consider the repeated appeals to expand its mainly Kabul-based peacekeeping force into the restive provinces.
NATO needed to send more troops by the end of next month if they were to be effective in protecting the electoral campaign and voting, he said.
Taliban and allied Islamic militants have vowed to disrupt the polls and the attack is just the latest on a provincial office working to register voters.
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