Arvind Kejriwal and five others were detained this morning from near the residences of Prime Minister Manmohan Singh, Congress chief Sonia Gandhi and BJP president Nitin Gadkari, as they assembled there for a protest and later released. The detentions came following the gathering of the activists on corruption issue near the residences of leaders in violation of prohibitory orders. Six Metro Stations in the capital, which were earlier announced to be closed today due to security concerns, will remain open throughout the day. Delhi Metro spokesman said the stations will remain open as Delhi Police had revised their advisory.