The total number of arrests in connection with the attack now stands at 18.
His younger brother, Dzhokhar Tsarnaev, 19, was captured and charged in connection with the attack.
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Thomas Curtis was also arrested in connection with the attack but died last year.
Police in Honduras said they were hunting a man and a woman in connection with the attack.
Portsmouth Crown Court judge Roger Hetherington dismissed the case of a 16-year-old boy also charged with the attack.
But officials said Auernheimer knew he was breaking the law with the attack.
Thomas was also arrested in connection with the attack but died last year.
Police were given a further 36 hours on Wednesday to question the men arrested in connection with the attack.
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Qais Khazali, a former spokesman for radical cleric Muqtada al-Sadr's Mehdi Army militia, was sought in connection with the attack.
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No-one has been arrested in connection with the attack on Playa Bonfil, but officials said they had leads to pursue.
Or the situation may require the aikidoist to blend with the attack in such a way that hurts the attacker.
At least one person has been arrested in connection with the attack.
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Asan Akbar, a combat engineer with the 326th Engineer Battalion of the 101st Airborne, is in custody in connection with the attack.
He was arrested in connection with the attack but died last year.
Gwent Police have arrested two men aged 21 and 19 in connection with the attack and they have been released on police bail.
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Nine other men, aged between 20 and 31, and two other women, aged 26 and 25, have already been arrested in connection with the attack.
In total, six people have been arrested in connection with the attack, including three men who were taken into custody Saturday, and another on Sunday.
Iraqi security forces arrested 15 people in connection with the attack.
Three people have been arrested in connection with the attack.
Officers have now released CCTV images of some men they want to speak to in connection with the attack, which happened as the bus was near the Westminster School.
Mr Bhagat said a case of rape had been registered in connection with the attack on the 19-year-old girl, who was found semi-naked by pedestrians on a road early on Thursday.
Last year the Chishti family took part in a public appeal for information on the whereabouts of Shahid Mohammed, who West Yorkshire Police want to question in connection with the attack.
Mr Mukhtar and Tousif Ahmed, the Calcutta trader who procured the SIM cards for him, may be handed over to Mumbai police because they are wanted in connection with the attack.
They are hoping to trace the driver and four passengers of a silver or white hatchback vehicle and are now also looking for a black 4x4 vehicle in connection with the attack.
Investigators warned police to be on the lookout for a "darker-skinned or black male" with a possible foreign accent in connection with the attack, according to a law enforcement advisory obtained by CNN.
News of the memo follows reports that two friends of Boston Marathon bombing suspect Dzhokhar Tsarnaev, who are now charged in connection with the attack, may have been in the country on expired student visas.
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