MOSCOW, Dec. 30 -- A trolley bus was ripped apart by a bomb blast Monday in the southern Russian city of Volgograd, killing at least 10 people and injuring 28.

This is the second attack in the city in two days after a suicide bomber struck its main train station.

Terrorist attacks in Russia have been on the rise recently, most of which relate to the conflict in Chechnya. The following are major terrorist attacks on Russia's transportation facilities in recent years:

-- In September 2003, a bomb went off in a suburban train in Stavropol region, killing seven and wounding nearly 90.

-- In December 2003, a blast in a passenger train in Stavropol region killed 47 people and wounded 186.

-- On Aug. 24, 2004, two passenger planes on domestic flights were simultaneously blown up mid-air, killing a total of 90 passengers and crew. Both planes took off from Moscow's Domodedovo airport.

-- On June 12, 2005, a train from Chechnya to Moscow was blown up in Moscow region. Forty-two people were injured.

-- In August 2007, a luxury Nevski Express train linking Moscow and St.Petersburg was derailed by a bomb planted under the rails. Sixty people were injured.

-- On Nov. 27, 2009, another Nevski Express train carrying high-ranking state officials was blown up, killing 28 and injuring over 90 people.

-- On March 29, 2010, two blasts in the Moscow subway killed 40 people and injured 85.

-- On Jan. 24, 2011, an explosion at the Domodedovo airport killed about 30 people and injured some 170.

-- On Oct. 21, 2013, a female suicide attacker blew herself up on a bus in Volgograd, killing seven and injuring dozens of others.

-- On Dec. 29, 2013, another suicide bombing hit Volgorad's railway station, killing at least 17 people and injuring 45 others. The blast was also conducted by a female, believed to be a "black widow" - women who seek to avenge the deaths of family members killed in battles with federal forces.

The latest attack, on Dec. 30, 2013, is the third bomb attack Volgorad has suffered in three months.