Several Muslim militants have been arrested in Indonesia in connection with a series of bloody attacks on Western targets in the country in recent years, police and media reports said Friday.

Police chief Gen. Dai Bachtiar declined to discuss the arrests in detail until the suspects had undergone questioning. He indicated the interrogations would take a week to complete.

"We have detained some people with links to terrorism," he told reporters. "We will release more details in seven days' time." Local media reported that between 11 and 24 men were arrested this week at various locations in central Java province.

The Jakarta Post said the men were suspected of involvement in the 2002 Bali nightclub bombings, which killed 202 people, most of them foreign tourists, and in the 2003 attack on the J.W. Marriott Hotel in Jakarta, the Indonesia capital.

Both attacks were blamed on Jemaah Islamiyah, a regional terror group intelligence officials say is financed by the al-Qaida network.

In the central Javanese city of Solo about 30 Islamic activists demonstrated against the arrests, saying police arbitrarily detained the men.

Police have arrested scores of militants in connection with the Bali and Marriott attacks, but several key suspects remain at large. Three men have been sentenced to death, and several more are serving long prison terms.

Most of those arrested have been found guilty of sheltering the bombers or withholding information about their whereabouts and sentenced to short prison terms. Many claimed to know nothing about the charges they were accused of, and were poorly defended in court.