At least 25 people were killed in three U.S. drone strikes launched on Monday in Pakistan's northwest tribal area of North Waziristan, reported local media.

According to the local media reports, four people were killed when a vehicle carrying suspected militants in the Miramshah area of North Waziristan was hit Monday night by two missiles of U.S. drones.

Hours before this, in the afternoon, U.S. drones fired two missiles at a vehicle suspected of carrying militants in the Mir Ali area of North Waziristan, leaving 15 people dead.

Prior to this, in late Monday morning, U.S. drones four missiles at two suspected vehicles in the same above-mentioned area, killing six people on board.

Monday's three strikes bring to 11 times the total number of strikes launched by U.S. drones since December. Up to the minute, at least 94 people have been killed in December strikes.

While most of the people killed by the U.S. drones are believed to be militants, such strikes do often mistakenly kill innocent people.

Not long ago, dozens of innocent people who lost their legs, arms, eyesight in U.S. drone strikes staged a protest in front of the parliament building in Pakistan's capital Islamabad, demanding the stop of the U.S. drone strikes in their hometowns located in the country's northwest tribal areas which border Afghanistan.