A few hundred marchers took to the streets of downtown D.C. at lunchtime Tuesday and later gathered near the White House as part of the International AIDS Conference, which ended with the arrest of 13 protesters.

The marchers departed from Mount Vernon Square near the Walter E. Washington Convention Center at noon, complete with the aid of a D.C. police escort.

One marcher was Jean Ross, co-president of National Nurses United, a union and professional association of registered nurses that claims 175,000 members. She said her group was marching in support of a Robin Hood tax that would put a “small tax on Wall Street speculation” to pay for HIV/AIDS treatment.

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