Police in the Netherlands said Friday that seven men arrested the day before plotted a major extremist attack and had the weapons to carry it out. The men, led by a 34-year-old Iraqi national, are accused of planning to attack a large public event. Raids of their homes Thursday found five handguns, large amounts of explosives for vests, and 220 pounds of fertilizer that could have been used to make a car bomb, authorities said.

ABUJA, Nigeria—Boko Haram extremists killed a Nigerian Red Cross employee abducted earlier this year, the International Committee of the Red Cross confirmed Monday. The insurgent group kidnapped Saifura Hussaini Ahmed Khorsa during a March attack in the town of Rann in northeastern Nigeria. The militants also abducted two other health workers and killed at least four security officials.

At least 27 Afghan security officials died in attacks staged by the Taliban across multiple provinces over the weekend, officials confirmed Monday. The militants targeted police checkpoints beginning Sunday night, said Fared Bakhtawer, head of the western Farah provincial council. Clashes in Baghlan province and the districts of Push Rod, Bala Buluk, and Badghis in Farah province left dozens of security officers and Taliban fighters dead. The Taliban has increasingly targeted security workers in recent weeks. The insurgent group claimed responsibility for the attacks.

Americans across the country Tuesday commemorated the 17th anniversary of the worst terrorist attack on U.S. soil. Nearly 3,000 people died on Sept. 11, 2001, when 19 hijackers crashed four planes in New York City; Washington, D.C.; and Shanksville, Pa. Victim’s relatives, rescuers, and survivors attended a memorial ceremony at New York’s World Trade Center at 8:46 a.m. Tuesday morning, the time when the first plane slammed into the center’s north tower. Less than 20 minutes later, another plane crashed into the south tower, in total killing 2,606 people.

UPDATE: Islamic State (ISIS) on Thursday claimed responsibility for Wednesday’s twin bombings in Kabul. The death toll in the attack climbed to 26 people overnight, the Afghan news site Khaama Press reported.

Government officials in Amsterdam said a 19-year-old Afghan citizen who stabbed two American tourists Friday at the city’s main railway station had a “terrorist motive.” Authorities said they based that conclusion on the suspect’s statements to police. The suspect, who holds a German residency permit and was shot and detained by police, was identified only as Jawed S. because of Dutch privacy rules. Police say the two unidentified Americans have serious but not life-threatening injuries and are recovering in a hospital. The suspect also is hospitalized. U.S.

A U.S. Army sergeant in Hawaii pleaded guilty Wednesday to providing secret military information and other forms of support to undercover agents he believed belonged to Islamic State (ISIS). Sgt. 1st Class Ikaika Kang admitted to four counts of aiding and assisting a known terror organization.