French and Belgian authorities say the attacks in Paris and Brussels may have been the work of one Islamic State terrorist cell, based in Brussels. French Prime Minister Manuel Valls said that Europe turned a blind eye to mounting extremism in its cities. European security officials had been bracing for a major attack for weeks and had warned that Isis (Daesh) was actively preparing to strike.

Brussels explosions LIVE: Multiple deaths after blasts at Zaventem airport and Maalbeek metro

The explosions came just days after Belgium's security services caught the last surviving suspect in November's attacks on Paris, in which 130 people were killed. Security experts believed the blasts were probably in preparation before the arrest of Salah Abdeslam, 26, accused of playing a key role in the Paris attacks. It appears Europe's most wanted man never left the Belgian capital. Family, friends and petty criminals helped him evade a manhunt for four months before he was arrested in the neighbourhood he grew up in, not far from his parents' home. The borough of Molenbeek has been described as a "Jihadist air base" because of the number of militant suspects believed to be living there.

IBTimes UK looks back at four months of terror in France and Belgium, beginning with the Paris attacks and the hunt for the perpetrators, and culminating in the capture of Abdeslam and the explosions in Brussels.

Terror in Europe
13 November 2015: French fire brigade members aid an injured individual near the Bataclan concert hall following fatal shootings in ParisChristian Hartmann/Reuters
Terror in Europe
13 November 2015: A victim's body lies covered on Boulevard des Filles du Calvaire, close to the BataclanThierry Chesnot/Getty Images
Terror in Europe
13 November 2015: Rescue service personnel work near covered bodies outside the Le Carillon restaurant in ParisPhilippe Wojazer/Reuters
Terror in Europe
16 November 2015: The Eiffel Tower is lit with the blue, white and red colours of the French flagBenoit Tessier/Reuters
Terror in Europe
Famous landmarks around the world are illuminated in the colours of the French flagReuters
Terror in Europe
A CCTV image shows Salah Abdeslam and Mohamed Abrini at a petrol station in Ressons, north of Paris, on 11 November 2015AFP
Terror in Europe
16 November 2015: Police officers use a camera as they prepare to enter a house in the Rue Delaunoy in the Molenbeek-Saint-Jean area of Brussels, several days after a series of deadly attacks in ParisDirk Waem/AFP
Terror in Europe
18 November 2015: A man is evacuated after being arrested by French police in the northern Paris suburb of Saint-Denis. At least one person was killed in an apartment during the hunt for suspected mastermind of the attacks, Belgian Abdelhamid AbaaoudKenzo Tribouillard/AFP
Terror in Europe
18 November 2015: A forensic specialist searches for evidence in the apartment raided by special forces in the northern Paris suburb of Saint-DenisJoel Saget/AFP
Terror in Europe
22 November 2015: People mourn outside the Le Carillon restaurant in Paris a week after a series of deadly attacks in the French capitalCharles Platiau/Reuters
Terror in Europe
22 November 2015: Belgian soldiers patrol Brussels' Grand Place after the city was placed on lock-downYves Herman/Reuters
Terror in Europe
22 November 2015: Belgian special police forces take part in an operation in the Molenbeek neighbourhood of BrusselsYves Herman/Reuters
Terror in Europe
24 November 2015: The coffin containing the body of Valeria Solesin, an Italian victim of the Paris attacks, is carried by gondoliers during her state funeral in VeniceManuel Silvestri/Reuters
Terror in Europe
27 November 2015: People wounded in the Paris attacks, and their family members, attend a ceremony to pay homage to the victims at Les Invalides monument in ParisCharles Platiau/Reuters
Terror in Europe
27 November 2015: French flags are seen on windows and facades of buildings in Paris after the French President called on all citizens to hang the tricolour to pay tribute to the victims of the attacksChristian Hartmann/Reuters
Terror in Europe
7 January 2016: A woman lights a candle as people gather on the Place de la Republique on the anniversary of the shootings at the satirical newspaper Charlie HebdoStephane Mahe/Reuters
Terror in Europe
15 March 2016: A masked Belgian policeman secures the area from a rooftop above the scene where shots were fired during the search of a house in the suburb of Forest near BrusselsFrancois Lenoir/Reuters
Terror in Europe
15 March 2016: A victim is removed from the scene where shots were fired during a police search of a house in the suburb of Forest near BrusselsFrancois Lenoir/Reuters
Terror in Europe
17 March 2016: Relatives and friends carry the coffin of Brahim Abdeslam, one of the attackers of the 13 November Paris attacks, during his burial ceremony at the interdenominational cemetery of Schaerbeek in BrusselsAFP
Terror in Europe
18 March 2016: Belgian policemen stand guard in a road during an operation in the Molenbeek-Saint-Jean district of Brussels, home to key Paris attacks suspect Salah Abdeslam
Terror in Europe
18 March 2016: Armed Belgian police apprehend Salah Abdeslam, one of the main suspects from November's Paris attacks, in Molenbeek, near BrusselsReuters
Terror in Europe
20 March 2016: The prison in Bruges where Paris attacks suspect Salah Abdeslam is being heldJohn Thys/AFP
Terror in Europe
22 March 2016: A soldier is seen inside Zaventem airport near Brussels, after twin explosions ripped through the departures hallJef Versele/Reuters
Terror in Europe
22 March 2016: A private security guard helps a wounded woman outside the Maalbeek metro station near EU institutions in BrusselsMichael Villa/AFP
Terror in Europe
22 March 2016:The Eiffel Tower in Paris is illuminated in the colours of the Belgian flag in tribute to the victims of the Brussels attacksPhilippe Wojazer/Reuters
Brussels attack explained: What we know about the deadly blasts that killed more than 30 peopleIBTimes UK