Singapore detains 3 Indonesian maids for allegedly donating funds to ISIS. (Representational image)

Singapore has detained three Indonesian maids without trial under tough security laws over allegations they donated funds to support the Islamic State (ISIS) group, authorities said.

It is the latest case of allegedly radicalised foreign domestic helpers arrested in the city-state, and the government said it highlighted the continued appeal of the jihadists' "violent ideology".

The trio, who worked as maids for between six and 13 years in Singapore, became supporters of ISIS after viewing online material last year, including videos of bomb attacks and beheadings, the interior ministry said.

Anindia Afiyantari, 33, Retno Hernayani, 36, and 31-year-old Turmini became acquainted around the time they were radicalised and developed a network of foreign contacts online who shared their pro-ISIS ideology.

"The three of them actively galvanised support online for ISIS," said the ministry in a statement late Monday, using an alternative name for ISIS.

"They also donated funds to overseas-based entities for terrorism-related purposes, such as to support the activities of ISIS and JAD. Turmini believed that her donations would earn her a place in paradise."

Officials did not say how much they contributed.

JAD refers to Indonesian militant outfit Jamaah Ansharut Daulah, which has pledged allegiance to ISIS.

The women are being held under the city-state's Internal Security Act, which allows for detention without trial for up to two years.

ISIS lost the last scrap of its self-declared "caliphate" this year but remains influential. There are fears that foreign fighters returning from the Middle East could rejuvenate terror networks elsewhere, including in Southeast Asia.

There has been a steady stream of such cases reported in Singapore, which is majority ethnic Chinese but has a sizeable Muslim minority.

Before the latest three cases, authorities had detected 16 radicalised foreign domestic workers since 2015, though none were found to have plans to carry out violent acts in Singapore. They were repatriated after investigations.

About 250,000 domestic helpers from other parts of Asia work in affluent Singapore.