NEW DELHI

Indian authorities filed terrorism charges Thursday against four suspects related to a security breach in the country's parliament.

The suspects, arrested by police in Delhi on Wednesday, included two who managed to enter parliament and set off a smoke canister in its lower house while lawmaking was in session.

Police booked the accused under various sections of the country's penal code, as well as its anti-terror Unlawful Activities Prevention Act, the Press Trust of India news agency reported.

The Home Ministry ordered a probe into the incident, which coincided with the 22nd anniversary of a deadly assault on parliament in 2001, in which over a dozen people, including attacking gunmen, were killed.