TROIS-RIVIERES, Que. - Four police officers face criminal charges following the violent arrest of an armed-robbery suspect that was caught on video. The four Trois-Rivieres municipal officers were arrested and released under a promise to appear in court on May 31. A surveillance video showed four people beating a suspect in a parking lot on Feb. 2. The incident attracted international attention once the video hit the Internet.

At least 21 people, including five members of the Guinean security forces, were wounded Thursday when violence broke out during an opposition march in Conakry, the government said. "At least five members of the security forces were wounded, including one who was stabbed," a government statement said, adding that several vehicles were also set on fire. Mamadou Alpha Barry, spokesman for the paramilitary gendarmerie, said two gendarmes and two policemen were in critical condition.

Three 19-year-old students -- two Kazakhs and an American -- were charged Wednesday with covering up for the suspected Boston marathon bombers, the US Justice Department said. Dias Kadyrbayev and Azamat Tazhayakov were accused of conspiring to destroy a laptop and backpack containing fireworks belonging to the suspected bombers. Robel Phillipos, an American, was charged with making false statements to law enforcement officials.

US police announced on Wednesday that they had arrested three more suspects as part of their investigation into a bomb attack on the Boston marathon that left three dead and more than 260 wounded. "Three additional suspects taken into custody in Marathon bombing case. Details to follow," the Boston Police Department said on Twitter. One of two ethnic Chechens, 19-year-old Dzhokhar Tsarnaev, was already in custody and has been charged with carrying out the bombing. His brother, 26-year-old Tamerlan Tsarnaev, was killed on April 18 during the manhunt for the pair.