Kenyan police said Tuesday they have managed to screen 3,000 people who have been rounded up in this week's security operation in Eastleigh suburb of Nairobi.

Administration Police spokesman Masoud Mwinyi said 467 suspects are being detained for further investigations while 69 others have been taken to court and charged with various offenses.

Mwinyi said that the suspects who appeared in court Tuesday are either refugees living outside the camps or have fake or no legal identification documents.

"Among those arrested are individuals who are in the country without valid documents, those who are outside the precincts of legally gazetted areas and those in inauthentic documents," Mwinyi hold a news conference in Nairobi.

He said the screening of suspects netted in on-going police crackdown on crime continued at the Safaricom Stadium, Kasarani.

He said that the ongoing security operation does not discriminate against individuals, community, religion or nationality.

Mwinyi said the exercise is meant to isolate genuine Kenyans from illegal immigrants, many of them suspected to be refugees who have deserted designated refugee centers.

He said the security crackdown will continue until it is convinced all suspects linked to crime are in custody as the police intensify operation in the city.

"As the operation continues, we are paying particular attention to documents such as the Kenyan national identity cards, passports, visas as well as work permits and refugee cards, all of which can be manipulated by unscrupulous persons," Mwinyi said.

The detainees, including women and children, are being held at a sports stadium and at various police stations, sparking concern with the United Nations.

The arrests took place in the mainly Somali neighborhood of Eastleigh, which was hit by three blasts during rush-hour last Monday evening and is also as a direct result of a series of terrorist attacks in the capital, including the deadly attack on the Westgate Shopping Mall in September 2013.

Kenya has been hit by a series of attacks since sending troops into southern Somalia in October 2011 to battle Al-Qaeda-linked Al- Shabaab insurgents, blamed for sporadic terror attacks including abduction of foreigners.

The government has ordered all Somali refugees living in towns to move into designated camps in northern Kenya in a bid to end the attacks.

Humanitarian groups are concerned over the security operation and mass arrests of Somali nationals over the weekend in Kenya's capital city of Nairobi.

On Monday, the UN refugee agency deplored a wave of arrest of refugees and asylum seekers that have taken place during the weekend in Nairobi, following recent terrorist attacks in the capital.

The UNHCR said it's seeking access to detained asylum- seekers and refugees who have been rounded up in security swoops in Eastleigh suburb of Nairobi.

"In line with its mandate, UNHCR has sought access for itself and its partners to the detained refugees and asylum-seekers.

This access will allow UNHCR to properly identify refugees, asylum- seekers and others of concern," the agency said in the statement.

However, the police dismissed claims of a humanitarian crisis at Kasarani stadium where suspects of the ongoing police swoop in Eastleigh are being held.

Mwinyi said the venue is only being used for verification of the suspects and not a confinement center as alleged and warned those who might be thinking of escaping that they will be nabbed in the ongoing operation.

Residents of the "little Mogadishu" because of it's predominantly Somali population have raised concern over the security operation which said violates human rights.

Eastleigh has been the scene of frequent terror attacks but the police have warned residents and travellers to be extra vigilant and volunteer any information that may assist in the investigations.