The arrest of leaders of an ethnic Indian rights group shines a spotlight on rising tensions in Malaysia. The government of Prime Minister Abdullah Ahmad Badawi appears unnerved by growing protests; its resort to the Internal Security Act (ISA) is a troubling sign. The focus of complaint is charges of discrimination against Indians, a minority in Malaysia. This sensitive and politically charged issue has to be addressed with subtlety and tact; mere repression will only make things worse.

Tens of thousands of demonstrators have taken to the streets in recent weeks in Malaysia. Opposition leaders first led marches demanding electoral reform. They were followed a couple of weeks later by ethnic Indians protesting government policies that institutionalize discrimination in the form of preferences for native Malays. Indians, who make up about 8 percent of the population, have long complained that they miss political, economic and education opportunities.

The government denies charges of discrimination. There are assertions that some Indian protest leaders are linked to terrorist groups. The call by one of the ethnic Indian leaders for India to halt trade with Malaysia opens the door to sedition charges. As the situation intensifies — the government used tear gas and water cannons against marchers last month — five leaders were arrested under the ISA, which allows confinement without trial for up to two years. Other demonstrators have been arrested under less draconian measures.