Turkish special force police officers patrol streets after a car bomb exploded near the stadium of football club Besiktas in Istanbul on December 10, 2016. 
The car bomb exploded in the heart of Istanbul on late December 10, wounding around 20 police officers, Turkey's interior minister said, quoted by the official Anadolu news agency. The bomb, apparently targeting a bus carrying police officers, exploded outside the stadium of Istanbul football club Besiktas following its match against Bursaspor. / AFP / YASIN AKGUL        (Photo credit should read YASIN AKGUL/AFP/Getty Images)
YASIN AKGUL/AFP/AFP/Getty Images
Turkish special force police officers patrol streets after a car bomb exploded near the stadium of football club Besiktas in Istanbul on December 10, 2016. The car bomb exploded in the heart of Istanbul on late December 10, wounding around 20 police officers, Turkey's interior minister said, quoted by the official Anadolu news agency. The bomb, apparently targeting a bus carrying police officers, exploded outside the stadium of Istanbul football club Besiktas following its match against Bursaspor. / AFP / YASIN AKGUL (Photo credit should read YASIN AKGUL/AFP/Getty Images)
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ANKARA, TURKEY - FEBRUARY 17: Smoke billows from the blast site as Turkish army service busses burn after an explosion on February 17, 2016 in Ankara, Turkey. 21 people are believed to have been killed and at least 61 are said to be wounded according to the city's governor Mehmet Kiliclar in what appeared to have been a car bomb attack on a vehicle carrying military personnel in the Turkish capital. (Photo by Defne Karadeniz/Getty Images)
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(CNN) —  

Throughout 2016, terror attacks have ripped apart small towns and big cities in the Middle East, Africa and Europe. This weekend brought no respite.

Three deadly blasts in major cities thousands of miles apart targeted sites where people gather for life’s daily rituals.

Different groups claimed responsibility for two of the attacks, carrying them out in the name of different political and religious causes.

In each of the three explosions, ordinary people paid the ultimate price, casualties of ongoing battles where there is no front line, no readily apparent uniform that denotes the combatants as friend or foe, and little anyone can do to ensure security.

By now, the message is clear: No place is truly safe, whether it’s a church, a park, a school or a busy street.

Istanbul, Turkey

When and where? Late Saturday night, December 10, after a heavily attended soccer game at Besiktas Vodafone Arena.

What happened? Two blasts about a mile apart killed at least 44 people, most of them police officers, and wounded 150. A remote control detonated a car bomb in the first explosion and a suicide bomber caused the second.

Officials investigate the scene of explosions near Istanbul's Besiktas stadium.
Ismail Coskun/IHA/AP
Officials investigate the scene of explosions near Istanbul's Besiktas stadium.

Why? The Kurdish Freedom Hawks (TAK), a breakaway group of the Kurdistan Workers Party (PKK), claimed responsibility on its website. The group, which is known to target the military and police, said the Turkish people were not the target of the attack. But the group inevitably ensnares innocent bystanders through its modus operandi, CNN military analyst Rick Francona said.

TAK goes after government agents in locations where it knows they will find them, such as stadiums or public gatherings where they assemble to do their jobs. “We know they’re responsible for a litany of violence against the Turkish government so it’s not surprising that they’re involved,” he said. “What we’re seeing is this continuation of tactics of going against the government.”

The attack will only make things worse for Kurds in Turkey, Francona said. President Recep Tayyip Erdogan has identified the PKK as an immediate danger to Turkey since the July 15 failed coup.

Erdogan has enacted emergency laws to close down pro-Kurdish media outlets, dismissed or suspended more than 11,000 teachers over alleged PKK connections, and he has selected at least 24 government appointees to replace Peoples’ Democratic Party, or HDP, mayors, including in the Kurdish-majority city Diyarbakir, according to Fadi Hakura of the Turkey Project at London-based Chatham House.

01:49 - Source: CNN
Turkey's president vows revenge after attack

Cairo, Egypt

A Coptic nun takes in the damage at Cairo's St. Mark's Coptic Orthodox Cathedral.
KHALED DESOUKI/AFP/Getty Images
A Coptic nun takes in the damage at Cairo's St. Mark's Coptic Orthodox Cathedral.

When and where? During Sunday morning mass at Cairo’s main Coptic house of worship, at St. Mark’s Coptic Orthodox Cathedral.

What happened? A bomb ripped through a section of the church for women, killing at least 25 and injuring dozens more. President Abdel Fattah El Sisi condemned the attack and declared a three-day period of national mourning.

KHALED DESOUKI/AFP/Getty Images

Why? No group claimed immediate responsibility for the attacks. Coptic Christians, who make up about 10 percent of Egypt’s 91 million residents, have been the targets of discrimination and violence since Hosni Mubarak’s ouster in 2011.

Mogadishu, Somalia

MOHAMED ABDIWAHAB/AFP/Getty Images

When and where? Sunday around 7:30 a.m. in Mogadishu, the nation’s largest city and capital.

What happened? A car bomb filled with explosives rammed into the main entrance of a port, killing at least 20 people and injuring 15, most of whom were port employees and pedestrians.

Why? The attack targeted police officers in the port’s customs and tax office, a police official said, apparently missing its target. Al Shabaab, a Somalia-based militant group with ties to al Qaeda, claimed responsibility for killing 30 officers in the attack. CNN was unable to confirm the claim but the attack bears the group’s hallmarks of detonating vehicles filled with explosives in busy areas. This year alone, the group claimed responsibility for a truck bomb that exploded outside the Somali presidential palace and a popular hotel in Mogadishu, killing 15; and a pair of suicide car bombings that struck a government building, killing 23 people, including rescuers.

Al-Shabaab means “the Youth” in Arabic. It wants to turn Somalia into an Islamist state, complete with a strict form of Sharia. They’ve even recruited some Americans from Minnesota’s Somali-American community.

CNN’s Arwa Damon, Max Blau, Ralph Ellis, Basma Atassi, Sarah Sirgany and Chandrika Narayan contributed to this report.