A suspected gunman accused of an attempted terrorist attack on an Oslo mosque and separately killing his teenage stepsister appeared in court on Monday looking bruised and scratched, but smiling.

The suspect did not speak, and his defense lawyer Unni Fries told The Associated Press he “will use his right not to explain himself for now.”

Philip Manshaus, 21, was arrested Saturday after entering a mosque in Baerum, an Oslo suburb, where three men were preparing for Sunday’s Eid al-Adha Muslim celebrations. Police said he was waving weapons and several shots were fired but did not specify what type of weapon was used. One person was slightly injured before people inside the Al-Noor Islamic Center held the suspect down until police arrived on the scene.

Police then raided Manshaus’ nearby house and found the body of his 17-year-old stepsister. He is also suspected in her killing, police said, but did not provide details.

The head of Norway’s domestic security agency said Monday officials had received a “vague” tip a year ago about the suspect, but it was not sufficient to act because officials had no information about any “concrete plans” of attack.

Hans Sverre Sjoevold, head of Norway’s PST agency, told a news conference that the agency and the police receive many tips from worried people every day and the information “didn’t go in the direction of an imminent terror planning.”

The suspect’s lawyer declined to comment on Norwegian media reports that Manshaus was inspired by shootings in March in New Zealand, where a gunman killed 51 people, and on Aug. 3 in El Paso, Texas, which left at least 22 dead.

The suspect smiled as he appeared in court Monday with dark bruises under both eyes and scratches across his face and neck. Police had said that he was prepared to cause deaths and more injuries but didn’t succeed because people inside the mosque helped neutralize him.