NEW : Ottawa officials searching databases and communications for possible clues . A plainclothes constable detailed to Parliament was shot in the leg , official says . Islamist army reservist Nathan Cirillo . Nathan Cirillo at a war memorial nearby . Cpl was killed at the National War Memorial . Lawmakers give standing ovation to the House of Commons official credited with stopping gunman .
NEW : Ottawa officials searching databases and communications for possible clues . A plainclothes constable detailed to Parliament was shot in the leg , official says . Islamist army reservist Nathan Cirillo . Cpl was killed at the National War Memorial . Lawmakers give standing ovation to the House of Commons official credited with stopping gunman .