A Tokyo man was referred to prosecutors Monday on suspicion of asking a minor to send him pictures of herself wearing only her underwear — the first case to emerge since a local ordinance was enacted this year to ban such acts, police said.

Using a social networking site, the man, 33, allegedly persuaded the 17-year-old in February to send her selfies by promising her money, the police said.

The man admitted to the allegation and the girl said she sent the photos because she wanted money, the police said.

The Tokyo Metropolitan Government amended a youth protection ordinance in February to begin penalizing acts in which people under 18 are asked to send improper photos of themselves through such means as intimidation, bribery or deception, becoming the first government in Japan to make such a rule.

The Hyogo Prefectural Government has a similar ordinance but it has not been applied since it took force in April.

Police detected a record 2,413 child pornography cases in 2017, with many involving children tricked into sending nude selfies to online acquaintances, according to the National Police Agency.

The metropolitan government amended the ordinance, saying the child pornography law has not sufficiently prevented children from sending selfies because it has no provisions for actually punishing those demanding such images.