The man was "suspected of complicity in the perpetrator's actions on February 14 and 15," police said in a statement.
"Like yesterday, a number of raids are being carried out in connection with the arrest," it added.
A fourth man was arrested yesterday in a downmarket area of Copenhagen, bordering the Noerrebro neighbourhood where El-Hussein lived.
Custody hearings held today for the men, who cannot be named for legal reasons, were not open to the public.
They were also charged with helping him get rid of clothing after the attack and for providing "other equipment" for the shooting that took place a few hours later outside a synagogue, where a Jewish man was killed.
The charges, which both men deny, did not specify what type of equipment they had given him before the second attack.
The 30-year-old reportedly wore a red hoodie when entering the court and threw a kiss at his girlfriend, who cried when the charges were read. The 25-year old wore a black hoodie.
Two other alleged accomplices have been detained since February 16 and a third since February 27, on suspicion of helping the 22-year-old gunman obtain and dispose off weapons.
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