Near-simultaneous grenade attacks on offices, businesses and gas stations in a northern Mexican state slightly injured three people, prosecutors said Tuesday.
Sonora state prosecutors' spokesman Jose Larrinaga said the attacks occurred in three cities, including the capital, Hermosillo.
The targets included two gas stations, a restaurant, a bank office and a building housing the state Attorney General's Office. The injuries were all from the restaurant attack; the victims were treated and released, Larrinaga said.
There was no immediate information on the attackers' identity or motive.
While cartels have been known to use grenades in battles with rivals and police, there was no immediate indication that late Monday's attacks were linked to drug violence that has plagued Mexico.
In 2008 in the western state of Michoacan, assailants tossed grenades into a crowd celebrating the Sept. 16 Independence Day holiday. Eight people were killed in the attack, which has been tied to drug traffickers.
At least two small bombs made of gas canisters have been tossed at the doors of businesses in Mexico City in recent months, without causing injuries. There is no indication of a drug link in those attacks.