Make use of the article to answer the questions.

Suspicion that a Norwegian citizen was involved in the deadly Westgate Mall attack in Kenya last month "has been strengthened" but is not yet confirmed, Norway's security service said.

The Norwegian citizen, said to be of Somali origin, is believed to have ties to Mohamed Abdikadir Mohamed, known as Ikrima, who is regarded as one of the most dangerous commanders in the Somali terror group Al-Shabaab.

The Norwegian security service, PST, said its investigations in Norway and Kenya were ongoing, and that despite some media outlets reporting a name for the possible Norwegian suspect, it was not ready to confirm his identity.

"It has not yet been determined whether a named Norwegian citizen actually took part in the attack or not," a PST statement said Friday.

"Based on the information that we have uncovered this far in the investigation, however, the suspicion of his involvement has been strengthened."

It has also not yet been determined whether the person in question is still alive, the statement said.

Kenyan counter terrorism sources said Norwegian intelligence services in Kenya were investigating both Ikrima and the Norwegian citizen and have spoken to the latter's sister in Norway.

But Trond Hugubakken, head of communications for the PST, told CNN on Saturday that the two Norwegian officers currently in Kenya are not investigating Ikrima, only the Norwegian citizen and his connections with Al-Shabaab, as they seek to establish whether he was in Kenya.

He said the citizen's name would be disclosed by Norwegian authorities only if he's confirmed to be one of the gunmen killed in the mall attack, or if they have sufficient evidence to issue an international warrant for his arrest.

1. Who leads PST?
2. And his title?
3. What is it?
4. Who is suspected?
5. What did he do?
6. What?
7. Where?
8. When?
9. Is there a confirmation?
10. Is he from Norway?
11. What is his nationality?
12. Is he tied to terrorists?
13. Which group?
14. Who is the leader?
15. Does he have an alias?
16. What is it?
17. Which officials are working with the Norwegians?
18. Who is under investigation?
19. Has his name been disclosed?
20. Does he have relatives?
21. What relationship?
1. Trond Hugubakken
2. head of communications
3. Norwegian security service
4. Norwegian citizen
5. attack
6. Westgate Mall
7. Kenya
8. last month
9. No?
10. Yes
11. Somali
12. yes
13. Al-Shabaab
14. Mohamed Abdikadir Mohamed
15. Yes
16. Ikrima
17. Kenyan
18. Ikrima
19. No
20. Yes
21. sister